同源性是序列同源或不同源的一种论断。两条蛋白质序列即使没有统计上显著的一致性，它们也可能是同源的，同源蛋白总是在三维结构上有显著的相似性，如果两条序列有一个共同的进化祖先,那么它们是同源的。
目的：了解一个细胞凋亡相关新基因TFAR19在不同种属间的序列同源性。
Objective: To find out the sequence homology of a novel gene TFAR19 (TF 1 cell apoptosis related gene 19) between different species.
结果结核分支杆菌重组抗原esat - 6与已发表氨基酸序列同源性为90%。
Results Compared with the amino acid sequence of ESAT-6 of Mycobacterium tuberculosis published, the homologies was 90%.
结果挑选了4个差异筛选的阳性克隆进行测序，序列同源性分析表明它们均与胰岛素- i基因序列高度一致。
Results four positive clones of differential screening were picked out for sequencing. Homology analysis indicated that all of the four clone sequences were the same as that of insulin-I gene.
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