title: Altered levels of beta-endorphin fragments after chronic morphine treatment of guinea-pig ileum in vitro and in vivo.
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D004361:Drug Tolerance; D004723:Endorphins / Q000378:metabolism*; D004743:Enkephalin, Leucine; D004744:Enkephalin, Methionine; D004745:Enkephalins / Q000378:metabolism; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009130:Muscle, Smooth / Q000187:drug effects*; D010446:Peptide Fragments; D011863:Radioimmunoassay; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D004745:Enkephalins; D010446:Peptide Fragments; D004744:Enkephalin, Methionine; D004743:Enkephalin, Leucine; D001615:beta-Endorphin; D009020:Morphine