The GP73/β-geo fusion protein is predominantly expressed in epithelial cells. Cryosections were stained for β-gal expression (light blue, arrowheads), and counterstained with Eosin Y and hematoxylin (purple). Photomicrographs of stomach (A), colon (B), small intestine (C), gall bladder (D), spleen (E), pancreas (F), uterus (G), testis (H), lung (I), kidney cortex (J), kidney medulla (K), and liver (L) from GP73tr/tr mice. Bars = 50 μm.