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.
DNA证据显示，真兽类和有袋类最后的共同祖先生活在1.6亿年前左右。
DNA evidence has suggested the last common ancestor to eutherians and marsupials lived around 160 million years ago.
在发现Juramaia前，已知的最早的真兽类动物是生活在1.25亿年前的Eomaia。
Before Juramaia's discovery, the oldest known eutherian was Eomaia that lived 125 million years ago.
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