[Jimmc414]

You are correct. I should have stated furin cleavage sites have not been observed in another beta coronavirus. (Cold, MERS, SARS) I corrected my statement. Thank you for pointing that out.

[etaoins]

That’s still incorrect. MERS is a Betacoronavirus and has a furin cleavage site: https://www.pnas.org/content/pnas/111/42/15214.full.pdf

Furin clevage sites haven’t been found elsewhere in SARS-Cov-2’s Sarbecovirus subgenus.