a study was made of the effects of some endogenous opioids ( beta-endorphin , gamma-endorphin , met-enkephalin , leu-enkephalin and dinorphin ) formed in the body from different high-molecular precursors ( pro-opiomelanocortin , proenkephalins a and b ) on the development in rats of the cysteamine-induced duodenal ulcers .
C0014295
met-enkephalin
C1418457
proenkephalins