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Native postnatal day 1 of life mouse bladder. a. Immunohistochemical detection of broad-spectrum uroplakin (brown) denoting mature urothelium. b. Immunohistochemical detection of p63 (brown) demonstrating urothelial basilar orientation. c. Immunohistochemical detection of Foxa1 (brown) seen in all urothelial cells denoting endodermal derivation of the cells. d. Complete lack of immunohistochemical detection of Foxa2.
