title: Factor in human CSF with apparent morphine-antagonistic properties.
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D006556:Heroin Dependence / Q000134:cerebrospinal fluid*; D006801:Humans; D007082:Ileum / Q000187:drug effects; D009020:Morphine / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D009130:Muscle, Smooth / Q000187:drug effects
chemical_list: D009020:Morphine