The proteolytic cleavage sites were all hexylbasic amino acids RRRKKR, with exception of LH (GKRKKR), which were the characteristic sequence of the highly pathogenic strains;

对其氨基酸序列进行分析，蛋白酶裂解位点序列除LH株为GKRKKR外，其余三株为RRRKKR，为高致病性禽流感病毒的特征序列；

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The proteolytic cleavage sites were all hexylbasic amino acids RRRKKR, with exception of LH (GKRKKR), which were the characteristic sequence of the highly pathogenic strains;

对其氨基酸序列进行分析，蛋白酶裂解位点序列除LH株为GKRKKR外，其余三株为RRRKKR，为高致病性禽流感病毒的特征序列；

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