The deduced amino acid sequence at the cleavage site of the HA protein was RSSR ↓ GLF, it was match to the characteristic of low virulent strain.

  • HA蛋白裂解位点的氨基酸组成为RSSR↓GLF,不舍连续的碱性氨基酸,具有低致病性AⅣHA基因裂解位点的序列特征。

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