前突变是诱变剂造成DNA分子某一位置的结构改变。
包括你在内的家族女性可能有基因前突变；
The women in the family (you included) may simply have a pre-mutation;
不过大约有20%的带有脆弱X前突变基因的妇女要发生过早绝经。
But up to 20 percent of women with fragile X pre-mutations undergo premature menopause.
本研究旨在构建具有猪 MSTN 前肽基因定点突变的真核表达载体。
This research intended to construct a eukaryotic expression vector with a site-directed mutation of porcine MSTN propeptide gene.
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