Source:http://linkedlifedata.com/resource/umls/id/C0014298
MSH: One of the three major families of endogenous opioid peptides. The enkephalins are pentapeptides that are widespread in the central and peripheral nervous systems and in the adrenal medulla.,CSP: one of the three major families of endogenous opioid peptides, endogenous pain inhibitors; they are pentapeptides that are widespread in the central and peripheral nervous systems and in the adrenal medulla.