title: beta-Endorphin: modulation of acute tolerance and antagonism by endogenous brain systems.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism*; D046508:Culture Techniques; D004298:Dopamine / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004361:Drug Tolerance; D004558:Electric Stimulation; D004723:Endorphins / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D009119:Muscle Contraction / Q000187:drug effects; D009433:Neural Inhibition / Q000187:drug effects; D009638:Norepinephrine / Q000494:pharmacology; D011292:Premedication; D011957:Receptors, Opioid / Q000187:drug effects*; D014020:Tissue Extracts / Q000494:pharmacology*
chemical_list: D004723:Endorphins; D011957:Receptors, Opioid; D014020:Tissue Extracts; D004298:Dopamine; D009638:Norepinephrine