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PGR immunostaining in an intact 13-week human fetal reproductive tract (AC122) grown for 4 weeks in a DES-treated ovariectomized female athymic mouse host. PGR is expressed strongly in epithelial and inner mesenchymal cells of the female reproductive tract (A). In vagina, PGR is expressed principally in the basal/suprabasal cells and in the adenosis (B).
