A hormonal role for endogenous opiate alkaloids: vascular tissues. Stefano G, Zhu W, Cadet P, Mantione K, Bilfinger T, Bianchi E, Guarna M. Journal Article 2002; 23(1): 21-26 PubMed PMID: 11880858 Keywords: Alkaloids:metabolism, Animals, Blood Vessels:physiology, Endorphins:physiology, Hormones:physiology, Humans,. Citation : The distribution of morphine-containing cells in the central nervous system, adrenal gland, and its presence in blood may serve to demon..... Read abstract Full text PDF