Guillemin R
Endocrinology. 1976 Dec;99(6):1653-4. doi: 10.1210/endo-99-6-1653.
Somatostatin inhibits the release of acetylcholine electrically induced in the myenteric plexus-longitudinal muscle of the guinea pig ileum. This effect is not mediated by opiate receptors. Tachyphylaxis to this effect of somatostatin has been observed.