Features suggestive of insertion
The argument
Because linked claim and linked claim, the site stands out as anomalous against its natural background, and given linked claim, that anomaly coincides with a documented proposal to do exactly this — together argued to point toward deliberate insertion.
Does it work?
- Does it follow?
- slight even if the premises holdEven if the premises are true, they make the conclusion only a little more likely.constitution →
- Do the premises hold?
- 1 verified2 not separately assessed
Granting its premises, that the site is absent from the closest sampled relatives, uses an uncommon CGG codon, and coincides with a documented proposal to insert such sites, the inference to deliberate engineering moves the conclusion only a little. Each feature is roughly as expected under natural origin as under insertion, so the clustering has weak discriminating power, and the proposal shows a hypothesis existed rather than that it was carried out on this sequence. The argument lives or dies on whether the features actually distinguish engineering from nature, which is exactly what the natural-occurrence and suboptimality considerations deny.
Premises
- 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 →The furin cleavage site is absent from the closest known natural relatives of SARS-CoV-2
- VerifiedThe evidence, examined directly, establishes the claim.constitution →The furin cleavage site in SARS-CoV-2 uses an arginine codon (CGG) uncommon in sarbecoviruses
- 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 →The DEFUSE proposal described inserting furin cleavage sites into SARS-related coronaviruses
Where it is made
Passages where sources make, criticize or mention this argument. They record where it appears, not how strong it is, and none has precedence over another.
No source is recorded as making it.