The morphology of the gastrointestinal tract.
D000818:Animals; D003106:Colon / Q000166:cytology; D006224:Cricetinae; D004064:Digestive System / Q000166:cytology*; D004724:Endoscopy; D006801:Humans; D008855:Microscopy, Electron, Scanning; D009092:Mucous Membrane / Q000166:cytology; D009093:Mucus; D011817:Rabbits; D051381:Rats