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Table 4 Synonymous and nonsynonymous mutations in the HA protein

From: Effect of the selection pressure of vaccine antibodies on evolution of H9N2 avian influenza virus in chickens

Immune status Tissue Sequenced HA genes HA variant sites Synonymous mutations Nonsynonymous mutations
Immunized Trachea 97 32 14 (43.75%)*$ 18 (56.25%)
Immunized Lung 99 33 19 (57.58)#$ 14 (42.42%)
Nonimmunized Trachea 102 32 17 (53.13%)*& 15 (46.87%)
Nonimmunized Lung 86 26 20 (76.92%)#& 6 (23.08%)
  1. *,$,#,&P < 0.05