A polypeptide has been isolated from the duodenal mucosa of hogs and has been named motilin. Motilin stimulates motor activity in both antral and fundic gland area pouches of the stomach of dogs. It will stimulate pepsin output, with no change in H + secretion, from fundic gland area pouches. Motilin differs from the other characterized gastrointestinal polypeptides both chemically and in its physiological actions. In particular, the presence of phenylalanine as N-terminal residue, the absence of histidine, and presence of large amounts of glutamic acid and glutamine distinguish it from cholecystokinin–pancreozymin and secretin.
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Brown et al. (1971) studied this question.