Shimamoto, C., Nakanishi, Y., Katsu, K., Nakano, T., Kubota, T., Mori, H. and Nakahari, T.: Prostaglandin E₂ release in gastric antral mucosa of guinea-pigs: basal PGE₂ release by cyclo-oxygenase 2 and ACh-stimulated PGE₂ release by cyclo-oxygenase 1. Exp. Phisiol. 91: 1015-1024, 2006