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KRT6 immunostaining of an intact 13-week (D) human fetal reproductive tract (AC121) grown for 4 weeks in an untreated ovariectomized female athymic mouse host and immunostained for KRT6. Stratified squamous epithelia of the presumed exocervix, vagina and vaginal plate (A, C & D) express KRT6 in basal through apical epithelial cells. Simple columnar epithelia of the uterine tube (not illustrated), uterine corpus and presumed endocervix do not express KRT6 (A-B).
