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Figure 1.
Fig. 1. Sequence alignment of 1918-human, 1930-swine, and
1934-human HAs. The subdomain structure of HA in the two
polypeptides, HA1 and HA2, that form each monomer is indicated
by the colored bars above the sequences. Carbohydrate attachment
sites are shaded gray. Residue numbering is on the basis of H3
HA sequence (1). Nonconserved residues are in red.
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