is characteristic AA mutation of has_specified_input has amino acid position serine SARS-CoV-2 Alpha variant S49- in SARS-CoV-2 S protein 49 Anthony Huffman S-S49del, S-S49- https://cov-lineages.org/ An AA mutation or AA variant that has mutated an amino acid at position 49 into a deletion SARS-CoV-2 S protein amino acid deletion