I'm sorry, that is simply not the case, neither at the protein level nor at the DNA level. Furin cleavage sites have diversity. The canonical minimal furin cl

I'm sorry, that is simply not the case, neither at the protein level nor at the DNA level. Furin cleavage sites have diversity. The canonical minimal furin cleavage site sequence is RX(R/K)R, which had a highly variable amino acid and a choice between the two basic amino acids in another position. This variability is sampled across the coronavirus furin cleavage site sequences.