Polarised enteric motor pathways involved in control of intestinal motor activity. Polarised enteric motor pathways involved in control of intestinal motor activity. ACh, acetylcholine; TK, tachykinins; NO, nitric oxide; ATP, adenosine triphosphate; VIP, vasoactive intestinal peptide; PACAP, pituitary activating cyclic AMP peptide; P2X, subclass of purinergic receptors. M Costa et al. Gut 2000;47:iv15-iv19 Copyright © BMJ Publishing Group Ltd & British Society of Gastroenterology. All rights reserved.