Table 2: Comparison of canonical envelop protein polybasic cleavage sites of different RNA viruses SARS-CoV-2 and other RNA viruses display the canonical (R/K)-(2X)n-(R/K)↓ motif (red bold alphabets) at cleavage site(s). The hydrophobic residues (except alanine) (black bold alphabets) at P2’ position of cleavage site favours the cleavage by furin/furin-like proteases.