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来自维基百科,自由的百科全书
外毛根鞘(英语:external root sheath或outer root sheath),简称外根鞘,是指由毛囊上皮根鞘外层未角化的细胞构成的结构[1]。外毛根鞘内部包裹着内毛根鞘和毛干[2]。
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