单词：principal piece
principal piece的用法和样例：
例句
- As spermatozoa progress through the epididymis they first acquire the capacity to phosphorylate tyrosine on targets on the principal piece, followed by the midpiece.精子进入附睾后，它首先获得将精子主段以及中段上的目的蛋白的酪氨酸磷酸化的能力。
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