本文综述了多肽的液相分段合成方法，这些合成方法是近年来多肽和蛋白质合成领域中的一种发展趋势。
In this paper, peptide segments liquid-phase synthesis technology are introduced and all of these are vivid in protein field recent year.
目的：通过在大肠杆菌中分段表达禽流感病毒聚合酶酸性蛋白(PA蛋白)，探索PA基因中可能影响表达的区域。
Objective: To study the effect of different fragments of PA gene on the expression of PA protein of avian influenza virus in Escherichia coli.
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