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Alignment of HA sequences of subtype H5 from different avian influenza A viruses over aa 281–350. The NCBI Protein numbers of the viruses used in the alignment are: AAC58994, ACZ48553, ACZ48585, AEA04387, AAA43205, AAC58998 and AAD37782, respectively. Amino acid substitutions within the alignment are shown in black.
