Delayed immune clearance may drive recurring waves of senescent cells and tissue damage
In linked tissue models, delayed immune removal of senescent cells may allow renewed accumulation and damage to neighbouring tissue. Recurrence despite verified correction of the delay would refute timing mismatch as a sufficient explanation.
Stage of verification
- Hypothesis published2026-09-30
- Indirect evidenceAssessed at 4 of 10
- Direct testAwaited
Map of the hypothesis
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Where in the body
Ageing mechanism
Lens
Kind of knowledge gap
A double ring marks the main placement where a group contains several values.
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.
Immune response
Immune surveillance
The immune response that recognizes and removes target cells through cytotoxic activity
Where this hypothesis actsIn linked tissue models after removal of chronically senescent cells
Hypotheses on this target 1
Inhibition
Activation
Function preservation
Clearance restoration1
Immunosuppression
Feedback restoration
Rhythm restoration
What is proposed
Clearance restoration
Shorten the delay between senescent cell emergence and effective immune clearance
With whatChange of environment or regimen
HowControl the timing of contact with cytotoxic cells while keeping total contact numbers and effectiveness per contact comparable
Possible result
Possible stabilization of SPV_2 and dampening of recurrent senescence and damage across tissues
From the recordСокращение задержки надзора должно стабилизировать SPV_2 и ослабить межтканевые волны повреждения.
All targets of the lab
Every target read from the published hypotheses, each kind around its pictogram. A larger mark means more hypotheses act on that target. Point at a mark and the actions proposed on it branch out of it.
Solid and named: the targets of this hypothesis
Explore in depth
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 cells that damage ageing tissues might bring only temporary relief if their replacements accumulate faster than the body removes them. The unexpected move is to locate the source of recurrence in the timing of immune responses, rather than in a lasting change to the material surrounding cells. This is a proposal generated by the pipeline, not a measured result: its distinguishing prediction is that changing when immune killing happens could prevent recurrence without increasing how much killing activity is supplied.
- Removal of the original senescent cells lowers the number of targets for immune removal.
- Effective immune killing is proposed to decline after a delay as the response catches up with the earlier reduction in targets.
- New senescent cells continue to arise against the remaining background of ageing.
- These cells accumulate and damage neighbouring tissue before immune removal catches up.
- The recovering immune response lowers the cell burden, while its delayed adjustment allows the cycle to recur.
- Shortening the delay, while keeping total killing activity comparable, is predicted to change recurring waves into disturbances that progressively subside.
A cleaning crew scheduled from old reports can leave just as fresh rubbish starts piling up, then return in force after the pile has grown. More timely scheduling could keep the pile smaller with the same total amount of work.
Where the picture breaks: Cells can alter immune behaviour and damage neighbouring tissue; rubbish does neither. The picture also does not establish that the proposed biological delay is long enough to produce repeated waves.
- Master questionstep 01 of 04
Processes that drive ageing may reinforce one another, so targeting a shared cause could benefit several body systems.
Rests on: The goal explicitly seeks shared causes through which one intervention might interrupt several damaging processes.
AssumptionThe goal takes as its working premise that mutually reinforcing ageing processes may have a shared cause that can be targeted for benefits across systems; it does not establish a particular cause or intervention.
- Goal pillarstep 02 of 04
Weakening the mutual reinforcement of age-related damage is the chosen route toward benefits across body systems.
Rests on: The master question explicitly identifies mutual reinforcement as a reason that targeting a shared cause could have broad effects.
Stated in the chain - Gap questionstep 03 of 04
Damage spreading between tissues might return after confirmed removal of senescent cells, cells in a persistent state of growth arrest that can affect their surroundings. Independently changing the mechanics of the extracellular matrix, the supporting material outside cells, is proposed as a way to investigate whether that material retains the source of renewed cellular senescence.
Rests on: The preceding goal motivates looking for a persistent source of mutually reinforcing damage, but does not identify cell clearance or the surrounding material as the particular route to investigate.
LeapThe chain does not supply the bridge from the general goal to recurrence after cell clearance or to matrix mechanics as its possible cause. The screened material provides related background, but does not establish this specific recurrence-and-matrix connection.
- Hypothesisstep 04 of 04
A late immune response is proposed to let new senescent cells accumulate after the original population has been removed. The proposed source of recurrence is a mismatch between cell accumulation and immune removal; shortening that mismatch is predicted to make repeated waves subside.
Rests on: The gap question supplies the recurrence to explain. The endpoint explicitly supplies its proposed basis: delayed negative feedback, a corrective response that acts after the condition triggering it has changed, represented by a model that separately tracks damaging cells and effective immune removal.
Stated in the chain
What is carried, and what is not. Two components of the proposed mechanism have direct background coverage in the supplied excerpts: immune removal and damage to neighbouring cells. S3, a 2026 Biogerontology review, discusses both immune clearance and the induction of senescence in nearby cells, but establishes neither delayed recurrence after clearance nor the proposed sequence end to end; none of the supplied sources establishes that sequence.S3
Where the reasoning is carried by something unstated · 2
- Master question. The goal takes as its working premise that mutually reinforcing ageing processes may have a shared cause that can be targeted for benefits across systems; it does not establish a particular cause or intervention.
- Gap question. The chain does not supply the bridge from the general goal to recurrence after cell clearance or to matrix mechanics as its possible cause. The screened material provides related background, but does not establish this specific recurrence-and-matrix connection. Establish the missing link before relying on this step.
How a result here could mislead · 3
- Earlier immune contact could appear to validate the timing hypothesis simply because it produces more contacts or more effective killing, rather than because it corrects a delay. What closes it: The comparison must keep starting cell burden, matrix composition, total contact number and killing effectiveness per contact comparable. Effective killing activity over time must be measured to verify that the intervention changes timing while preserving comparable total activity.
- A fall in one overall inflammation measure could be mistaken for correction of the mismatch between cell accumulation and immune removal. Conversely, persistent recurrence could be called a refutation even if the intervention never corrected that mismatch. What closes it: Cell burden and effective immune removal must be measured separately through time, with tissue damage assessed alongside them. The claimed correction of the delay must be verified, and the predicted timing of the next peak specified before that peak is observed. The supplied label SPV_2 has no definition and cannot substitute for specified measurements.
- Suppressing recurrence through earlier removal could be read as excluding the rival explanations, although continuing mechanical injury, altered attachment to surrounding proteins or damage arising inside cells could still generate the cells being removed. What closes it: A claim that distinguishes those rivals requires measurements or independent interventions addressing their proposed sources of new damage. The timing comparison alone can test whether earlier removal suppresses recurrence, but cannot establish that those other sources are absent.
What would make this wrong. Persistent recurring cell accumulation and tissue damage after confirmed initial clearance and verified shortening of the immune-response delay, with comparable starting conditions and total effective killing activity, would contradict the proposal that the timing mismatch is sufficient to explain recurrence. Failure of the measured timing mismatch to predict the next peak would also contradict its stated distinguishing prediction.
What it would change. If the prediction held, coordinating immune removal with the appearance of damaging cells would become a candidate way to weaken age-related damage across tissues. Work pursuing a shared intervention would have to consider response timing alongside the number of cells removed. Success in linked tissue models would still leave unestablished whether the same control is achievable in old mice, benefits multiple systems in an intact organism or extends life.
Sources read · 10
Tumor dormancy and disease recurrence. · Cancer metastasis reviews · 2023
“more research is needed about the possible role of myeloid derived suppressor cells (MDSC) in escape of cancer harboring senescent cells/dormant tumor cells from innate and adaptive immune responses that would otherwise guard against cancer recurrence and metastasis.”
Does not settle: Источник не проверяет запаздывающую отрицательную обратную связь иммунного надзора, повторные волны сенесцентных клеток, повреждение соседней ткани или влияние сокращения задержки надзора на SPV_2.
Senolytics for cancer treatment: complexities and opportunities. · Expert opinion on therapeutic targets · 2026
“Third, efficacious agents do not necessarily eliminate the risk of proliferative recovery that could reflect disease recurrence.”
Does not settle: Источник отмечает риск пролиферативного восстановления после сенолитиков в опухолевых моделях, но не устанавливает запаздывающую отрицательную обратную связь иммунного надзора, рецидив сенесцентных клеток, волны повреждения тканей, роль матрикса или эффект сокращения задержки надзора.
Closing the gap in aging science: unlocking the potential of nanoparticles in senescence therapy. · Biogerontology · 2026
“First, these factors are suggested to regulate immune clearance of SCs to prevent fibrosis and promote tissue regeneration [ , , ]. Contrariwise, SASP factors can induce the development of secondary senescence within non-senescent nearby cells [ ].”
Does not settle: Источник не устанавливает запаздывающую отрицательную обратную связь иммунного надзора после удаления хронически сенесцентных клеток, рецидивы, волны повреждения между тканями или эффект сокращения задержки надзора на SPV_2.
Rethinking glioma-associated senescence: Drivers of heterogeneity and therapeutic resistance. · Biochimica et biophysica acta. Reviews on cancer · 2026
“Additionally, we analyze the dual role of TIS in glioma treatment and the mechanisms by which TIS-associated senescence-like states may contribute to tumor recurrence.”
Does not settle: Источник оставляет открытыми роль запаздывающей иммунной обратной связи, снижение цитотоксической активности после удаления клеток, временное накопление сенесцентных клеток, повреждение соседней ткани, межтканевые волны и влияние сокращения задержки надзора.
Hyperbaric oxygen therapy increases telomere length and decreases immunosenescence in isolated blood cells: a prospective trial. · Aging · 2020
“The accumulation of senescent cells with aging reflects either an increase in the generation of these cells and/or a decrease in their clearance, which in turn aggravates the damage and contributes to aging [ ].”
Does not settle: Источник не устанавливает запаздывающую отрицательную обратную связь иммунного надзора, рецидив после удаления хронически сенесцентных клеток, изменения цитотоксической активности, межтканевые волны повреждения или эффект сокращения задержки надзора на SPV_2.
Pharmacological Modulation of Immunosenescence and Inflammaging: Senolytics, Senomorphics, and Emerging Therapies. · Immunological investigations · 2026
“Accumulation of senescent cells and the senescence-associated secretory phenotype (SASP) play a central role in sustaining chronic inflammation and disrupting tissue homeostasis.”
Does not settle: It does not establish recurrent waves after clearance, a delayed negative-feedback mechanism in immune surveillance, reduced cytotoxic activity after lowering cell burden, or whether shortening surveillance delay stabilizes SPV_2 or reduces intertissue damage waves.
Autologous cytokine-induced NK cells as candidate cellular senolytics: evidence, obstacles, and the experiments still needed. · GeroScience · 2026
“Senescent cells accumulate in aged tissues, secrete a pro-inflammatory milieu that propagates dysfunction to neighbors, and exhaust the immune compartment that should clear them.”
Does not settle: Источник не устанавливает, что после удаления хронически сенесцентных клеток возникает рецидив из-за задержки отрицательной обратной связи иммунного надзора. Он не описывает временное рассогласование клеточной нагрузки и цитотоксической активности, повторные волны повреждения ткани, роль матрикса или эффект сокращения задержки надзора.
The senescence-immune axis as a target for combining immunotherapy and senotherapy. · Ageing research reviews · 2026
“Rather than acting independently, senescent cells (SnCs) and immune cells engage in a dynamic and bidirectional crosstalk that influences immune surveillance, inflammatory signaling, and tissue remodeling.”
Does not settle: This abstract does not establish delayed negative feedback after senescent-cell clearance, recurrent waves of senescent cells or tissue damage, causal temporal misalignment between cell burden and cytotoxic activity, matrix effects on recognition kinetics, or that shortening surveillance delay stabilizes SPV_2.
Myeloid TGF-β signaling shapes liver macrophage heterogeneity and metabolic liver disease pathogenesis. · JHEP reports : innovation in hepatology · 2025
“PD-L1/PD-L2-expressing cells inhibit cytotoxic T cell function via the inhibitory receptor PD-1.”
Does not settle: Источник не изучает удаление хронически сенесцентных клеток, рецидив, задержку обратной связи, колебания клеточной нагрузки или межтканевые волны повреждения. Данные получены в моделях MASH у мышей и не устанавливают причинную роль отсроченного иммунного надзора.
Identification of senescence-related genes in diagnosing idiopathic pulmonary fibrosis via integrating bioinformatics analysis and machine learning. · PloS one · 2026
“Our study also suggests potential interactions between senescence-associated pathways and the IPF immune microenvironment.”
Does not settle: Источник не устанавливает, что задержка иммунного надзора вызывает рецидив сенесцентных клеток, волны повреждения тканей или что сокращение такой задержки стабилизирует SPV_2.
The gap this hypothesis explains
Two live hypotheses pull in opposite directions here, and the field has not chosen between them.
Does changing tissue scaffolding explain whether damage returns across tissues after confirmed removal of persistently aging cells?
Original wording · exactly as the pipeline generated it
Возобновляется ли межтканевое повреждение после подтверждённого удаления хронически стареющих клеток, и покажет ли независимое изменение механики матрикса, что именно он сохраняет источник повторного клеточного старения?
What this question is asking
The question concerns whether removing persistently damaged cells ends a continuing source of tissue injury or only temporarily reduces its effects. These cells are described as senescent: they remain in an altered state and can release substances that affect surrounding tissue. The question asks whether, after the original stress ends and their removal is confirmed, these cells and damage return in skin and blood vessels, and whether tissue function remains impaired over weeks or months. It also asks whether independently changing the physical properties of the extracellular matrix, the scaffolding around cells, changes that recurrence compared with leaving those properties unchanged. This assumes that the scaffolding can retain a physical memory of earlier damage and cause replacement cells to become senescent, an assumption the supplied sources do not establish.
- Cellular senescence
- A persistent altered cell state commonly involving withdrawal from cell division and changes in what the cell releases. Senescence includes varied states; it is not simply another name for a cell being old, and the question concerns states that persist and contribute to damage.
- Senescence markers
- Measured features used to identify or estimate senescence. A reduction in these features is not equivalent to direct proof that all relevant senescent cells have been removed.
- Verified clearance
- Confirmed removal of the relevant senescent-cell population. This is a requirement of the question, distinct from observing fewer markers or better tissue function.
- Secretion
- The release of substances by cells into their surroundings. The proposed mechanism depends on harmful effects of substances released by senescent cells, but the supplied findings do not establish the complete chain leading to recurrent damage.
- Extracellular matrix or tissue scaffolding
- Material outside cells that surrounds and supports them. Its maintenance and physical properties are distinct features, so evidence about matrix maintenance alone does not establish a mechanical cause.
- Matrix mechanics
- The physical behavior of tissue scaffolding, including how strongly it resists deformation. The question asks whether changing these properties independently affects renewed senescence.
- Mechanical memory
- Here, the proposed persistence of a physical tissue condition after the original stress or damaging cells have gone. The supplied sources do not establish that this condition causes replacement cells to become senescent.
- Damage across tissues
- Injury involving more than one tissue, here particularly skin and blood vessels. Damage in both tissues would not by itself prove that one caused damage in the other.
- Navitoclax
- The drug used in S2, where treatment reduced senescence markers and improved blood-vessel function. Those reported effects do not establish lasting recovery after verified clearance.
- Doxorubicin
- The chemotherapy drug used to induce the vascular change studied in S3. This exposure is a specific injury setting and does not establish what happens in persistent senescence more generally.
- Arteries and the aorta
- Arteries carry blood away from the heart; the aorta is the main artery leaving it. Their ability to widen, contract, and resist stretching describes different aspects of blood-vessel function.
- Dermis
- The supporting layer of skin beneath its outer surface. S5 reports a reduction in senescent cells in its upper portion in tissue maintained outside the body.
Removing senescent cells reduces the source of damaging secretion, while mechanical memory in the extracellular matrix can recreate damaging senescent states after removal.
The extracellular matrix is the material surrounding and supporting cells, and its mechanical properties describe how it resists forces or changes shape. The assumption is that this material retains a harmful physical condition after damaged cells are removed and then drives other cells into the same damaging state. If established, this would explain why removing the current cells might leave the cause of their replacement intact.
The supplied search results did not return work establishing the complete claim. S2 reports improved blood-vessel function alongside reduced senescence markers, and S3 reports prevention of increased aortic stiffness with senescent-cell removal. S9 summarizes earlier work linking cell clearance with reduced secretion associated with senescence and improved matrix maintenance. These findings concern benefits of reducing senescence; they do not establish that retained matrix mechanics recreate senescent cells after verified clearance. S7 proposes possible disruption of matrix maintenance, but does not demonstrate the reverse causal step from altered matrix mechanics to renewed senescence. This bounded evidence does not show that the premise is false.S2S3S7S9
The same question asked without the part nothing read establishes:
- After the original stress ends and persistent senescent cells are demonstrably removed, does damage recur across skin and blood vessels, and does independently changing matrix mechanics alter that recurrence?
- Does verified removal of persistent senescent cells produce sustained reductions in senescence and sustained functional recovery in skin and blood vessels?
- Damage returns and depends on scaffold mechanics If independently changing scaffold mechanics changes renewed senescence and damage after verified clearance, that would support a causal contribution from the remaining scaffold. Cell removal would then reduce the current damaging population while leaving a physical condition capable of helping replenish it.
- Damage returns without established scaffold causation Recurrence would show that verified removal did not secure lasting recovery under the conditions observed. If changing scaffold mechanics does not alter recurrence, or its contribution remains unresolved, recurrence alone would not identify the scaffold as the remaining cause.
- Damage does not return Sustained recovery after verified removal would be consistent with eliminating a continuing source of damage over the observed period. A scaffold-driven return of senescence would then be unnecessary to explain the measured outcome, although the result would remain limited to the tissues and duration observed.
The proposed chain begins with senescent cells releasing substances that contribute to tissue damage. Removing those cells could reduce that source, but if altered scaffolding causes other cells to become senescent, the source could be replenished and damage could return. If removal instead produces lasting recovery, continued damage would not require such replenishment under the conditions observed. Mistaking an initial improvement for lasting recovery would overstate what cell removal accomplishes; attributing recurrence to scaffolding without evidence would assign the cause prematurely. The supplied evidence supports some benefits associated with reducing senescence, but does not establish this proposed recurrence chain.
Удаление клеток RL-2 уменьшает источник секреции; механическая память RL-1 допускает повторное образование повреждающих состояний после удаления.
После прекращения нагрузки избыток стареющих состояний в коже и сосудах сокращается за недели и месяцы, функции выходят из ухудшенного плато.
Не установлено, устраняет ли удаление клеток причину устойчивого повреждения или временно сокращает популяцию, которую заново создаёт матрикс.
The mechanism it proposes
The engine's own statement of the hypothesis, in full.
После удаления хронически сенесцентных клеток рецидив возникает из-за запаздывающей отрицательной обратной связи иммунного надзора. Снижение клеточной нагрузки вызывает отсроченное снижение эффективной цитотоксической активности; вновь возникающие клетки успевают накопиться и повредить соседнюю ткань до восстановления надзора. Причинное состояние хранится в временном рассогласовании клеточной нагрузки и иммунного ответа. Матрикс может менять скорость контактов и распознавания, однако самостоятельного механического источника повторного старения для этого объяснения не требуется. Сокращение задержки надзора должно стабилизировать SPV_2 и ослабить межтканевые волны повреждения.
Where the idea comes from
The hypothesis borrows a result from another field. This is what it borrows, and from where.
Теория управления: устойчивость отрицательной обратной связи с задержкой и наблюдаемость внутреннего состояния. Проверяемая модель: dS/dt = g - aS - bES; dE/dt = cS(t-τ) - dE. Здесь t означает время; S означает нормированную нагрузку сенесцентными клетками; E означает нормированную эффективную активность иммунного удаления; g означает скорость появления новых сенесцентных клеток на сохраняющемся возрастном фоне; a означает скорость их исчезновения через прочие пути; b означает эффективность удаления при контакте с иммунным эффектором; c означает чувствительность активации надзора к клеточной нагрузке; d означает скорость угасания надзора; τ означает задержку между появлением мишени и эффективным ответом. Около положительного равновесия S*, E* характеристическое уравнение имеет вид (λ + a + bE*)(λ + d) + bS*c exp(-λτ) = 0; λ означает показатель роста или затухания малого возмущения. Все корни с отрицательной действительной частью означают локальную устойчивость; пересечение мнимой оси допускает колебательную потерю устойчивости, которую затем проверяют в нелинейной модели. Измерительный вектор y = (S, E) делает оба состояния наблюдаемыми; один суммарный показатель воспаления их не разделяет. Это предложенная модель, а не установленный закон старения.
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.
При одинаковых составе матрикса, начальной клеточной нагрузке и интегральной цитотоксической активности сокращение задержки иммунного ответа переводит повторные волны сенесценции в затухающее восстановление. Подача той же суммарной активности с исходным запаздыванием сохраняет рецидив. Измеренный сдвиг фазы между появлением новых сенесцентных клеток и их удалением заранее предсказывает время следующего пика. Сохранение рецидива после подтверждённой коррекции задержки опровергает это объяснение как достаточное.
States a measurable outcome; comparing rivals needs more conditions. The prediction specifies contrasting observable dynamics under matched conditions, predicts peak timing from a measured phase shift, and states an explicit rejection condition. No rival prediction is supplied. Only a bench experiment would settle it.
What testing it would take
The engine's own read on whether this is testable with methods that already exist.
В связанных тканевых моделях можно независимо задавать время контакта с цитотоксическими клетками и измерять уничтожение меченых мишеней. Эксперимент должен сохранять сопоставимыми суммарное число контактов и эффективность отдельного контакта. Перенос такого управления на старых мышей существенно сложнее.
Other explanations
Every other hypothesis the engine wrote for the same gap, and the observation that would separate the two.
При одинаковых составе матрикса, начальной клеточной нагрузке и интегральной цитотоксической активности сокращение задержки иммунного ответа переводит повторные волны сенесценции в затухающее восстановление. Подача той же суммарной активности с исходным запаздыванием сохраняет рецидив. Измеренный сдвиг фазы между появлением новых сенесцентных клеток и их удалением заранее предсказывает время следующего пика. Сохранение рецидива после подтверждённой коррекции задержки опровергает это объяснение как достаточное.
- What would separate them
Removing senescent cells may renew damage by removing their mechanical protection predicts: После одинакового подтверждённого удаления исходных клеток инертные микрогели, воспроизводящие их расположение и способность рассеивать энергию, предотвращают ранние пики деформации ядер, последующее появление новых сенесцентных клеток и повреждение связанной сосудистой ткани. Контрольные микрогели того же размера и начальной жёсткости, но с другой диссипацией, такого эффекта не дают. Первые повреждения возникают в клетках, которые ещё не вступили в синтез ДНК. Если механическая замена при подтверждённом восстановлении распределения нагрузки не предотвращает рецидив, гипотеза уступает химическому, генотоксическому или регуляторному объяснению.
- Rival 02 of 03What would separate them
Chemical changes in fibronectin may restart cell senescence through altered integrin binding predicts: На матриксах с одинаковыми начальной жёсткостью, релаксацией и плотностью обычных участков прикрепления частота повторного старения зависит от количества доступных isoDGR. Их избирательное маскирование предотвращает рецидив, а добавление определённых isoDGR-содержащих фрагментов возвращает его. Изменение одной только релаксации при фиксированной доступности isoDGR даёт существенно меньший эффект. Если химическая коррекция с подтверждённым действием на мишень не изменяет рецидив, гипотеза уступает механическому или внутриклеточному объяснению.
- Rival 03 of 03What would separate them
Mobile genetic element cutting may restart cellular senescence after senescent-cell removal predicts: После подтверждённого удаления исходной сенесцентной популяции в отслеживаемых ранее несенесцентных клетках сначала возрастает активность LINE-1 и число повреждений ДНК, затем появляются устойчивое прекращение деления и секреторный фенотип. Подавление LINE-1 с последующим восстановлением эндонуклеазно-активным ORF2 возвращает рецидив; восстановление вариантом с отключённой эндонуклеазой при сопоставимой экспрессии этого не делает. Механическая коррекция матрикса и маскирование isoDGR не устраняют этот контраст. Отсутствие зависимости от эндонуклеазы при подтверждённом действии вмешательства опровергает гипотезу.
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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.
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0 citation handles extracted; 1 Europe PMC search run; 0 records examined; 0 sources stored for enrichment, 0 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.