设想一下在一个基因上发生了一个新的突变。
尽管发生在鸭子身上的这种基因突变实属罕见，但类似情况此前在世界其他地区也有过报道。
The mutation is rare, but cases have been recorded across the world.
然而人类个体的基因生来就是正常的，很少发生突变（变异）。
Most of an individual's genes, however, are inherently good.
逆转录酶基因耐药性突变的发生率是38.9%（14/36）。
The mutation rate of resistance to reverse transcriptase was 38.9 %(14/36).
本研究从HBV基因突变入手，进一步探讨可能与宫内感染发生有关的突变位点。
Some gene position's mutation might have association with the HBV intrauterine infection.
本研究从HBV基因突变入手，进一步探讨可能与宫内感染发生有关的突变位点。
Some gene position's mutation might have association with the HBV intrauterine infection.
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