Amino acids at variable sites of the HA gene segment of A/H3N2 influenza viruses from the ‘N-lineage’, clade a, clade b, and singleton isolates s1, s2, s3, and s4 (Figure 6), with differing amino acids in bold.
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Antigenic sites are specified A–E (listed in parentheses) and sites that have been identified as undergoing positive selection denoted by an asterisk (*) [37].
创建时间：
2008-08-22
