Clearing residual bacteria redirects protein-cutting enzymes toward host tissue
In some older adults with residual bacterial infection, clearing bacteria may remove proteins that compete with host tissue for enzyme cleavage. In paired tissue cultures, replacement with cleavable microbial protein must prevent injury without preserving infection; a cleavage-resistant counterpart must fail.
Omega Point 1.2
Stage of verification
- Hypothesis published2026-09-21
- Indirect evidenceAssessed at 4 of 10
- Direct testAwaited
Map of the hypothesis
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Where in the body
Biological function
Kind of knowledge gap
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Target map
Every target of every published hypothesis, each with the actions a hypothesis can propose on it. The targets and the actions of this hypothesis are drawn solid.
Enzyme
Proteases
Enzymes that break down proteins
Where this hypothesis actsExtracellular neutrophil proteases during clearance of residual bacterial infection in older adults
Hypotheses on this target 7
Inhibition6
Activation
Lower level1
Higher level
Replacement
Protection from degradation
Cofactor removal
Synthesis suppression
Function preservation
What is proposed
Inhibition
Reduce protease cleavage of host proteins
With whatProtein or peptide as the agent
HowNeutralize proteases or add purified, readily cleavable microbial substrate to compete with host proteins during pathogen suppression
Possible result
Possible prevention of new tissue injury and stabilization of SPV_5 during pathogen clearance
From the recordProtease neutralization prevents this deterioration.
Single microbe
Bacterial pathogens
Bacteria that cause infection
Where this hypothesis actsResidual bacterial infection in a subset of older adults
Hypotheses on this target 1- Inhibition1
- Lower level
Elimination
Colonisation
What is proposed
Inhibition
Suppress bacterial pathogens to interrupt microbial substrate supply
With whatSmall molecule
HowUse non-lytic pathogen suppression with drug-only controls and matched released microbial products
Possible result
Expected increase in host-protein cleavage after bacterial substrates disappear unless competing substrate is replaced
From the recordPathogen suppression stops this substrate supply; after existing bacterial substrates disappear, unchanged protease molecules redirect cleavage toward host tissue.
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The logic
The train of thought that ends in this hypothesis. Each stage is the reason the next exists. The master question narrows to a goal, the goal to an unknown nobody has closed, the unknown to the hypothesis proposed here. Every step below says what it rests on and what carries it.
Removing an infection might, under the proposed mechanism, leave tissue more exposed to damage even as the number of living bacteria falls. The unexpected move is that bacterial proteins could temporarily protect the body by occupying protein-cutting enzymes; stopping their supply would leave those same enzymes cutting the body's proteins instead. This is a proposal generated by the pipeline, not a measured result.
- Residual bacteria are proposed to keep supplying proteins outside cells.
- Those bacterial proteins are proposed to occupy protein-cutting enzymes that would otherwise attack the body's proteins.
- Bacterial suppression is proposed to stop that supply, with existing bacterial proteins disappearing afterward.
- The same enzyme population is predicted to switch from cutting competing bacterial proteins toward cutting more of the body's proteins.
- The increased cutting of body proteins is predicted to cause new tissue injury and worsening function.
- A noninfectious, cuttable replacement is predicted to restore competition and prevent injury while bacterial suppression continues.
Imagine a running paper shredder receiving both scrap paper and important documents. If scrap paper occupies much of its capacity, stopping the scrap supply could let it destroy more important documents without speeding up the machine.
Where the picture breaks: Proteins do not enter a single orderly queue. The picture does not establish whether bacterial proteins reach the same enzymes as body proteins or compete sufficiently at the concentrations present in tissue.
- Master questionstep 01 of 04
Durable recovery from age-related immune decline would require restoring both rapid, broadly acting defenses and defenses that learn to recognize particular threats to healthy young-adult ranges. Recovery must also preserve remembered protection, avoidance of attacks on the body's own tissue, and control of infections that remain in the body in an inactive state.
Rests on: The goal defines successful recovery as restored function together with preservation of existing protection and restraint.
Stated in the chain - Goal pillarstep 02 of 04
Removing harmful material and then bringing the damage response to an end are treated as a sequence whose failure could allow damage to grow.
Rests on: The master goal requires lasting functional recovery without losing protection or damaging the body.
AssumptionThe chain takes failure of this clearance-and-recovery sequence as a relevant barrier to immune restoration. The supplied pillar is a title and supplies no explanation establishing that connection.
- Gap questionstep 03 of 04
Normal blood measures of inflammation could coexist with worsening function. Selectively suppressing hidden infection or neutralizing injury-related material outside cells is proposed as a way to distinguish continuing infection from tissue damage that sustains itself, before recovery becomes impossible.
Rests on: The preceding pillar identifies failure between removal of harmful material and the ending of damage as the problem to investigate.
Stated in the chain - Hypothesisstep 04 of 04
Bacterial proteins are proposed to occupy proteases, enzymes that cut proteins, released outside cells by neutrophils, a type of immune cell. Suppressing bacteria would eventually remove these competing substrates, the materials an enzyme acts on, redirecting the same enzymes toward the body's proteins. A harmless replacement that can be cut is predicted to prevent the resulting injury without preserving infection.
Rests on: The gap question supplies the possibility that tissue damage continues despite infection control. The endpoint adds competition between bacterial and body proteins as its proposed explanation.
AssumptionThe mechanistic premise is that bacterial proteins compete strongly enough at actual tissue concentrations to divert these enzymes from body proteins. Neither the preceding stage nor the supplied source evidence establishes that premise; it is the assumption the proposal would test.
What is carried, and what is not. Three screened sources provide background for enzyme release or host damage: S1, in Antibiotics in 2022, reports release of a protein-cutting enzyme by airway immune cells in cystic fibrosis, an inherited disease affecting airway mucus; S2, in The European Respiratory Journal in 2010, reports cutting of structural body proteins in that disease setting; and S3, in Critical Care in 2019, reports enzyme-mediated blood-vessel lining damage in sepsis, a damaging response to infection. None establishes competition between bacterial and body proteins, the proposed switch after bacterial suppression, or the sequence end to end in older adults.S1S2S3
Where the reasoning is carried by something unstated · 2
- Goal pillar. The chain takes failure of this clearance-and-recovery sequence as a relevant barrier to immune restoration. The supplied pillar is a title and supplies no explanation establishing that connection.
- Hypothesis. The mechanistic premise is that bacterial proteins compete strongly enough at actual tissue concentrations to divert these enzymes from body proteins. Neither the preceding stage nor the supplied source evidence establishes that premise; it is the assumption the proposal would test.
How a result here could mislead · 3
- Injury following bacterial suppression could be attributed to redirected enzyme activity when the treatment itself, or material released as bacteria break apart, caused the damage. What closes it: The proposal specifies suppression that does not break bacteria apart, controls for the drug's own effects, and matched exposure to released bacterial products. These comparisons must separate treatment-related injury from injury that begins after the competing bacterial proteins disappear.
- Protection from the replacement protein could be read as proof of competition even if it reduces enzyme activity or changes the number of living bacteria. The supplied S6 study, in American Journal of Physiology. Lung Cellular and Molecular Physiology in 2013, reports protection of human airway-lining cells against fluid loss without changing the measured activity of the implicated enzyme; it does not test substrate replacement or the proposed redistribution.S6 What closes it: The proposed comparison between cuttable and cutting-resistant replacements must be accompanied by measurements of living bacteria, enzyme amount, and the enzymes' ability to cut. Isotope-resolved cleavage products, fragments distinguished using atomic labels, must show the predicted reciprocal shift between cutting bacterial proteins and cutting body proteins.
- Failure of replacement to prevent injury could be mistaken for rejection of the mechanism when the replacement never competed effectively. Conversely, less injury could be mistaken for recovery of the intended function because SPV_5, the named outcome, is undefined in the supplied material. What closes it: A rejecting result requires verified competition at measured tissue concentrations, as the proposal states. The meaning and measurement of SPV_5, the timing of assessment after bacterial proteins disappear, and what counts as stabilization must be specified before interpreting functional recovery.
What would make this wrong. The proposal explicitly identifies failure of substrate replacement to prevent injury despite verified competition as a rejecting observation. Its central redistribution claim would also fail if bacterial proteins disappeared under the controlled conditions without the predicted shift toward cutting body proteins. Continued injury alone would not establish either rival: persistent, spatially organized injury signaling and delayed failure of cell division caused by earlier chromosome damage would still require their own evidence.
What it would change. If the mechanism held, infection control and tissue recovery could come apart because removing bacterial proteins changes what existing enzymes attack. Work toward durable immune restoration would then have to account for this transition when judging whether clearing infection is sufficient for recovery. Even a positive result in the proposed patient-derived cultures would not establish lasting restoration of immune function in older adults, preservation of remembered protection, avoidance of attacks on the body, or control of inactive infections.
Sources read · 6
Elastase-Activated Antimicrobial Peptide for a Safer Pulmonary Treatment of Cystic Fibrosis Infections. · Antibiotics (Basel, Switzerland) · 2022
“Neutrophils represent the major cell population among the inflammatory cells recruited to the airways of CF patients, where they are responsible for the in situ release of elastase [ ].”
Does not settle: This source does not test older adults with residual bacterial infection, pathogen clearance, competitive diversion of neutrophil proteases between bacterial and host substrates, host-tissue cleavage after bacterial substrates disappear, SPV_5, or replacement with a noninfectious competing substrate.
Airway proteins involved in bacterial clearance susceptible to cathepsin G proteolysis. · The European respiratory journal · 2010
“CG has numerous substrates in the CF lung and has been shown to cleave components of the extracellular matrix, including collagen, fibronectin, and elastin [ ].”
Does not settle: It does not test older adults, pathogen suppression or clearance over time, competition between bacterial and host substrates, redistribution of unchanged protease activity, SPV_5, or replacement with a noninfectious competing substrate.
Composed endotypes to guide antibiotic discontinuation in sepsis. · Critical care (London, England) · 2019
“Neutrophil proteases are involved in the pathogenesis of the coagulation alterations observed in sepsis and mediate endothelial damage.”
Does not settle: This source does not establish bacterial clearance, competitive diversion of neutrophil proteases between microbial and host substrates, unchanged protease abundance, residual infection in older adults, SPV_5, or replacement with a noninfectious competing substrate.
The neutrophil serine protease inhibitor serpinb1 preserves lung defense functions in Pseudomonas aeruginosa infection. · The Journal of experimental medicine · 2007
“However, serpinb1 −/− mice have considerably increased mortality relative to WT mice in association with late-onset failed bacterial clearance.”
Does not settle: This mouse lung-infection study does not test older adults, pathogen suppression, clearance-triggered substrate competition, SPV_5, or replacement with a noninfectious competing substrate.
Immunological Characteristics in Refractory Chronic Rhinosinusitis with Nasal Polyps Undergoing Revision Surgeries. · Allergy, asthma & immunology research · 2019
“Human neutrophil elastase-positive cells were also enhanced in rNP compared with pNP.”
Does not settle: This cross-sectional study does not test bacterial clearance, substrate competition, protease redirection toward host tissue, SPV_5, functional deterioration after suppression, or replacement with a noninfectious substrate.
Nonantibiotic macrolides prevent human neutrophil elastase-induced mucus stasis and airway surface liquid volume depletion. · American journal of physiology. Lung cellular and molecular physiology · 2013
“GS-459755 had no effect on HNE activity. However, GS-459755 pretreatment protected against HNE-induced ASL volume depletion in human bronchial epithelial cells (HBECs).”
Does not settle: This source does not test residual bacterial infection or its clearance, microbial protein substrates, redistribution of neutrophil protease cleavage toward host tissue, SPV_5, or noninfectious substrate replacement during clearance.
The gap this hypothesis explains
What is measured here stands in for what matters, and may not track it.
Can suppressing hidden infection versus neutralizing released damage material distinguish why tissue function worsens before recovery becomes impossible?
Original wording · exactly as the pipeline generated it
When blood inflammation normalizes but function deteriorates, can selective pathogen suppression versus extracellular injury-cargo neutralization distinguish occult infection from autonomous tissue damage before either exceeds recovery limits?
What this question is asking
The question concerns worsening tissue function despite blood measurements suggesting that inflammation has returned to normal. It asks whether selectively suppressing disease-causing organisms, compared with neutralizing potentially harmful material released outside injured cells, can distinguish hidden infection from tissue damage that continues without infection. The comparison would need to show whether functional deterioration responds differently to the two interventions, and whether that difference identifies the responsible cause. The question assumes that existing monitoring detects this mismatch but cannot establish its cause, and asks whether the distinction can be made while recovery remains possible. Its broader setting is restoring immune function in people with age-related immune impairment.
- Inflammation and blood inflammation measurements
- Inflammation is a biological response associated with infection, injury, and repair. Blood measurements track selected features of that response; the supplied input does not identify the measurements or define what counts as normal.
- Tissue function and recovery limits
- Tissue function means how well a body tissue performs its role. Recovery limits name the proposed boundary beyond which that performance cannot be restored; no such boundary is specified or validated here.
- Occult infection and selective pathogen suppression
- Occult infection means infection that has not been readily detected. Selective pathogen suppression means reducing the disease-causing organism with an intervention intended to act specifically on it.
- Extracellular injury cargo and neutralization
- This means material released outside cells during injury, and interventions intended to prevent its harmful activity. It is a broad class of material, not one substance, and released material can also participate in recovery.
- Autonomous tissue damage
- Here this means injury that continues without requiring an ongoing infection. The supplied sources do not establish that independence in the situation posed.
- Age-related immune impairment
- This means reduced or altered performance of the body's defenses associated with aging. The question's broader aim concerns restoring those defenses, but the supplied studies do not establish that outcome.
- RL-2 discordance rules and RL-3 functional tests
- These are pipeline labels for rules that flag mismatched measurements and tests of biological performance. Their expansions, procedures, and validation are not provided.
- Tissue antigen and injury signatures
- An antigen is biological material recognizable by the immune system; an injury signature is a pattern of measurements associated with damage. Finding either does not automatically explain whether the detected material or process is sustaining the damage.
- Connexin-43 channels and Peptide5
- Connexin-43 forms channels in cell membranes. Peptide5 is the channel-blocking intervention associated with protection in the mouse study described by S1.
- Interleukin-1 beta
- An immune signaling protein blocked in S2. That study's reported healing outcome cautions against assuming that blocking an inflammation-related signal necessarily improves repair.
- Extracellular vesicles
- Small membrane-enclosed packages released by cells that carry biological material. They are a class of packages with different contents and effects, including the protective effects described in S3 and injury-associated material examined in S4.
- Prosaposin and receptor
- Prosaposin is the molecule implicated in the protective signaling described in S3. A receptor is a protein that receives a biological signal; the supplied title and quotation spell this study's receptor label differently.
- Nucleic acids and Toll-like receptors 3 and 9
- Nucleic acids are molecules that carry genetic information and can also stimulate immune responses when released from cells. Toll-like receptors 3 and 9 are immune sensors whose activation S4 reports inhibiting through nucleic-acid capture.
- Fluorodeoxyglucose positron emission tomography
- An imaging method using a detectable sugar-like tracer to locate areas of biological activity. S5 discusses its limited ability to distinguish infection from cancer and inflammation without infection.
RL-2 discordance rules and RL-3 functional tests detect abnormalities; tissue antigen and injury signatures do not establish the responsible driver.
The pipeline describes monitoring rules and tests of biological performance that flag a mismatch between reassuring blood results and worsening function. It also assumes that finding recognizable biological material or signs of injury in tissue does not identify what keeps the damage going. If this holds, detecting an abnormality and identifying its cause are separate problems, which motivates the proposed comparison.
S5 supports a narrower concern: the imaging method it discusses sometimes poorly distinguishes infection, cancer, and inflammation without infection. It does not establish the performance of the pipeline's monitoring rules, functional tests, or tissue measurements. The supplied sources do not establish that these rules detect deterioration during a defined period when recovery remains possible.S5
The same question asked without the part nothing read establishes:
- When blood inflammation measurements normalize but tissue function worsens, can suppressing infection versus neutralizing released damage material identify the cause?
- Can responses to infection suppression and released-material neutralization distinguish infection-driven injury from injury that continues independently of infection?
- The responses distinguish the causes Under the question's proposed logic, improvement specifically following infection suppression would support infection as a continuing driver, while improvement specifically following neutralization would support released material as a driver. For this to identify the cause, the responses would need to distinguish those explanations reliably; the supplied sources do not establish that reliability or whether the distinction arrives before recovery is lost.
- The responses do not distinguish the causes If both interventions help, neither helps, or their effects cannot be attributed specifically to their intended targets, the response pattern would leave the cause unresolved. Improvement alone would then be insufficient to classify the deterioration as hidden infection or independently continuing tissue damage.
- The distinction arrives too late Even a reliable distinction could fail the timing requirement if it becomes apparent only after function can no longer recover. Identifying the cause would then settle the explanatory question without establishing the early warning capability the pipeline requires.
If hidden infection sustains injury, suppressing the responsible organism could interrupt the process that damages tissue. If material released by injured cells sustains further damage independently, suppressing infection alone could leave that process active. However, released material can also support recovery: S3 reports that blocking one such signal removes inflammation-resolving effects, although its supplied quotation is unverified. Mistaking a protective signal for harmful material could therefore undermine recovery, while mistaking an intervention response for proof of the underlying cause could leave the actual driver unresolved. The supplied sources do not establish how long either mistake could persist before recovery becomes impossible.
RL-2 discordance rules and RL-3 functional tests detect abnormalities; tissue antigen and injury signatures do not establish the responsible driver.
Discordant recovery triggers investigation within the surveillance window, before persistent dysfunction exceeds clinically justified limits.
Convert reassuring blood-marker discordance into experimentally discriminated causes and validate detection lead time against subsequent functional deterioration.
The mechanism it proposes
The engine's own statement of the hypothesis, in full.
In a subset of older adults with residual bacterial infection, renewed microbial protein production competitively diverts extracellular neutrophil proteases away from host proteins. Pathogen suppression stops this substrate supply; after existing bacterial substrates disappear, unchanged protease molecules redirect cleavage toward host tissue. Functional deterioration therefore reflects a clearance-triggered redistribution of catalytic activity, rather than greater pathogen abundance or increasing injury-cargo concentration. Replacing the competing substrate with a noninfectious equivalent during clearance should stabilize SPV_5 without preserving infection.
Testing and possible results
The prediction that would tell it apart
A hypothesis that predicts what its rivals predict is not worth running an experiment over. This is the observation on which this one differs.
In paired tissue cultures, pathogen suppression increases host-protein cleavage and new tissue injury after bacterial-substrate turnover, despite falling viable burden and unchanged protease abundance and intrinsic catalytic competence. Protease neutralization prevents this deterioration. Adding purified, readily cleavable microbial substrate during suppression also prevents injury without changing viable burden; a matched cleavage-resistant substrate does not. Isotope-resolved cleavage products must demonstrate reciprocal movement from microbial to host substrates. Failure of substrate replacement to rescue injury despite verified competition rejects this hypothesis. Non-lytic suppression, drug-only controls, and matched released microbial products distinguish substrate diversion from antibiotic toxicity or killing-induced toxin release.
Would tell it apart from at least one rival. The prediction specifies observable changes, contrasting substrate effects, and an explicit rejection condition. No rival prediction is supplied. A paper already fetched for this hypothesis bears on it.
What testing it would take
The engine's own read on whether this is testable with methods that already exist.
Patient-derived epithelial and immune co-cultures can support the four specified treatment arms plus substrate add-back controls. Activity-based probes and targeted cleavage-product measurements can distinguish enzyme quantity, catalytic competence, and substrate choice. The critical feasibility constraint is demonstrating physiologically relevant competition at measured tissue concentrations.
Other explanations
Every other hypothesis the engine wrote for the same gap, and the observation that would separate the two.
In paired tissue cultures, pathogen suppression increases host-protein cleavage and new tissue injury after bacterial-substrate turnover, despite falling viable burden and unchanged protease abundance and intrinsic catalytic competence. Protease neutralization prevents this deterioration. Adding purified, readily cleavable microbial substrate during suppression also prevents injury without changing viable burden; a matched cleavage-resistant substrate does not. Isotope-resolved cleavage products must demonstrate reciprocal movement from microbial to host substrates. Failure of substrate replacement to rescue injury despite verified competition rejects this hypothesis. Non-lytic suppression, drug-only controls, and matched released microbial products distinguish substrate diversion from antibiotic toxicity or killing-induced toxin release.
- Rival 01 of 02What would separate them
Self-organized danger and inhibitor signals sustain tissue injury after infection clears predicts: After independently verified pathogen elimination, spatial imaging reveals a reproducible injury wavelength that emerges from small perturbations. A model fitted before intervention must predict how changing inhibitor spread changes that wavelength. Spatial redistribution of inhibitor at matched mean exposure can abolish persistent injury, whereas the same mean exposure delivered in the original pattern does not. Uniform, well-mixed preparations relax toward recovery under matched reaction conditions. Cargo neutralization sufficient to remove the instability prevents pattern reformation; pathogen suppression alone does not. Absence of measurable local self-amplification, longer-range inhibition, or a diffusion-induced unstable mode rejects this specific mechanism rather than being excused as generic feedback.
- What would separate them
Infection leaves chromosome damage that causes delayed tissue loss during repair predicts: With verified pathogen suppression and sustained extracellular cargo neutralization, new injury still follows aberrant divisions of cells carrying pre-existing chromosome lesions. Live lineage imaging shows chromosome bridges, segregation errors, or micronucleus formation before cell loss. A reversible experimental delay of cell-cycle entry shifts injury onset by the corresponding interval; releasing the delay restores division-associated injury unless lesions have resolved. Conditioned medium collected before those divisions does not transfer the phenotype to undamaged cells. Pathogen-directed treatment, cargo neutralization, and their combination fail to prevent the initial delayed deaths, distinguishing this mechanism from both extracellular rivals.
Why this is not the mainstream account
The engine is asked to say what its hypothesis would overturn and what would surprise a specialist. This is its answer.
Neutrophil elastase cleaves bacterial OmpA, and another study found unusually selective cleavage of Shigella virulence factors. These observations establish microbial substrates and marked substrate selectivity, not the proposed host-protective diversion: [OmpA degradation study](https://pubmed.ncbi.nlm.nih.gov/10947984/), [virulence-factor cleavage study](https://www.nature.com/articles/417091a).
Postinfectious disease pathogenesis; the textbook chapter 'Bacterial pathogenesis and host-mediated tissue injury' would require a causal branch in which eliminating a residual pathogen increases host-directed proteolysis because the pathogen had supplied competing substrates. The strong revision is that this redistribution can dominate the post-clearance functional trajectory.
Sterilization worsens tissue function, but adding a noninfectious, protease-cleavable microbial protein restores function without inhibiting the protease or permitting microbial survival; its cleavage-resistant counterpart fails.
A targeted search identified microbial inhibition of neutrophil proteases and microbial proteins serving as protease substrates, but did not identify a review advancing this precise clearance-triggered substrate-diversion explanation for deterioration in older adults. This is a provisional novelty assessment, not proof of universal literature absence. Finding that exact explanation already advocated would disqualify the HERETICAL designation.
What stands behind it
Which of the figures above have a study behind them, which are the engine's own, and what it would take to refute the hypothesis. This audit never judges the idea.
This hypothesis states no figure and cites no study, so there is nothing here to trace.
What it would take to refute it. 5 paper(s) already retrieved for this hypothesis carry its prediction’s terms. Reading them comes before running anything. Already retrieved: Application of artificial intelligence in geriatric infection: recent advances and prospects.; Clinical recovery of severe infantile <i>Angiostrongylus cantonensis</i> meningoencephalomyelitis treated with pulse methylprednisolone: A case report and review of literature.; Thymic selection of the T cell receptor repertoire is biased toward autoimmunity in females..
6 papers retrieved around this hypothesis
- Neighborhood Deprivation, Antibiotic Prescribing Concordance, and 30-Day Outcomes After Emergency Department Encounters in Older Adults.PMID 42529259 · full_text · 36,354 characters stored
- Application of artificial intelligence in geriatric infection: recent advances and prospects.PMID 42662092 · full_text · 84,793 characters stored
- Association between infections and frailty: a systematic review protocol.PMID 42716678 · full_text · 33,515 characters stored
- Thymic selection of the T cell receptor repertoire is biased toward autoimmunity in females.PMID 42623268 · full_text · 127,228 characters stored
- From screening to surveillance: integrated prevention of <i>Helicobacter pylori</i>-associated gastric cancer in the Asia-Pacific region.PMID 42694987 · full_text · 94,586 characters stored
- Clinical recovery of severe infantile <i>Angiostrongylus cantonensis</i> meningoencephalomyelitis treated with pulse methylprednisolone: A case report and review of literature.PMID 42626348 · full_text · 42,575 characters stored
0 citation handles extracted; 1 Europe PMC search run; 8 records examined; 6 sources stored for enrichment, 6 with full text. A citation that did not resolve is a bibliographic failure, not proof that no such paper exists, and no hypothesis is blocked by this audit.