Clustal alignment of the envelope protein of SARS-CoV1 and SARS-CoV2.
Mutations in (C)-terminus domain in the E protein protein of SARS-CoV2 are T55S, V56F, E69R (the mutation of an amino acid A1 to an amino acid A2 is denoted by A1pA2 where p denotes location in the reference amino acid sequence).The deletion mutation of G at the 70th position with respect to the reference envelope protein of SARS-CoV1 is also noted.