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Ribbon diagram of the trimeric HA molecule with depicts the amino acid residues differentiating variant strain (F10) from parent ones (F7-F9) shown in yellow; (P74S, D97N, H110R, S123P, R140G, F144Y, N165H, A184E). The majority of these sites are exterior residues. E359 (HA2- 29E) is present in F7-F10 isolates.
