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ShowingImportancePrizesTopicFurin cleavage site
The SARS-CoV-2 furin cleavage site (FCS) at the S1/S2 spike junction: its presence or absence in sarbecoviruses, its biological function, and claims about its natural acquisition versus laboratory construction or insertion in proposed experiments; a recurring element in origin-of-SARS-CoV-2 arguments.
The furin cleavage site in SARS-CoV-2 uses an arginine codon (CGG) uncommon in sarbecoviruses
VerifiedThe claim traces to reliable primary sources through a clear chain of evidence.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 originSarbecovirus codon usageimportance · minorImportance 0.35, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The furin cleavage site in SARS-CoV-2 is evidence of laboratory engineering
ContestedCredible evidence or argument exists on multiple sides.constitution →evaluativeA judgment of worth or quality against some standard: good, fair, effective.constitution →SARS-CoV-2 originVirologyimportance · notableImportance 0.60, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The furin cleavage site is absent from the closest known natural relatives of SARS-CoV-2
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 originimportance · minorImportance 0.30, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The DEFUSE proposal described inserting furin cleavage sites into SARS-related coronaviruses
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →DEFUSE proposalVirologyimportance · notableImportance 0.45, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Natural recombination can generate furin cleavage site insertions in coronaviruses
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Coronavirus recombinationSARS-CoV-2 originimportance · notableImportance 0.50, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The furin cleavage site in SARS-CoV-2 is suboptimal and not an idealized engineered sequence
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →SARS-CoV-2 originVirologyimportance · notableImportance 0.50, from 0 to 1 · notable: a contested point in a live debate (also the default before judging). Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
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