Fig. 4From: Effect of the selection pressure of vaccine antibodies on evolution of H9N2 avian influenza virus in chickensMost frequently occurring mutations. a The statistics of the most frequently occurring variants. b–e Location of the most frequently occurring variants on the 3D structure. b VB; c VL; d NB; and e NL. Residues: 198: red; 234: yellow; 131: salmon; 168: firebrick; 201: warm pink; 114: cyan, 224: split pea; 281: forest; and 285: blueBack to article page