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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.

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.

>To clarify this sequence has not been identified in any other virus in the wild.

>this sequence

>this

>sequence

Not with the same PRRAR sequence of amino acids, right?

Right, the furin cleavage site seems to have occurred independently in SARS-CoV-2 or one of its undiscovered close relatives.