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Amino acid sequence changes from clade B (NY32) to clade B′ (NY470) in the 4 ribonucleoprotein proteins. Bold italics indicate amino acid changes that were not found in either NY26 (clade A) or NY32 (clade B). Underlined changes were fixed in subsequent clade B′ progeny viruses. R433K is R in NY32 (clade B) and K in NY470 (clade B′).
