title: Beta-endorphin: naturally occurring or synthetic agonists and antagonists.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004723:Endorphins / Q000138:chemical synthesis / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology; D006801:Humans; D011957:Receptors, Opioid / Q000378:metabolism; D013045:Species Specificity; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D011957:Receptors, Opioid; D001615:beta-Endorphin