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1·The researchers analyzed the function of the mutant proteins, establishing that it was the triggering kinase segment of the protein that was central to the enzyme's defective function.

研究人员分析了突变蛋白的功能，发现它是该蛋白激发激酶作用的部分，是酶缺矢功能的核心环节。

2·The repressor gene and its allele-a temperature sensitive mutant have been cloned from the defective prophage PBSX of Bacillus subtilis by means of PCR technique.

本研究利用聚合酶链式反应技术，成功地克隆了枯草芽孢杆菌缺陷型原噬菌体PBSX阻遏基因及其温度敏感型等位基因。

3·A white colony mutant, 1-40-271, was normal in sporulation and spore germination, but defective in appressorium development and totally lost in pathogenicity.

突变体1-40-271菌落呈白色，产孢与萌发均正常，但萌发后即便在人工疏水表面上也不能形成附着胞，且丧失了致病性；