... is found in the epithelial lining of upper GI tractincluding the tongue, esophagus and stomach, but not in the small and large intestines. In the rat, Aldh1 is present higher up in the GI tractfrom ... observed in the epithelial cells at the base of the intestinalglands in rectum and moderate levels of Adh4 are present in the epithelial cell layer of tongue, esophagus and stomach, where the signal ... epithelial cells of the tongue and esophagus, in the gastric glands and at the base of the villi in jejunum. The apparent signal in the outer keratinized layer of the tongue and esophagus is due...