Electro-potential differences in the gastrointestinal tract: present status.
D000818:Animals; D005753:Gastric Mucosa / Q000502:physiology*; D006801:Humans; D007413:Intestinal Mucosa / Q000502:physiology*; D007420:Intestine, Large / Q000502:physiology; D007421:Intestine, Small / Q000502:physiology; D008564:Membrane Potentials; D008722:Methods