title: [Mechanism of analgesia induced by epidural morphine. 1. The sensitive radioimmunoassay of morphine using goat antiserum].
mesh_terms: D000767:Anesthesia, Epidural; D006801:Humans; D009020:Morphine / Q000378:metabolism*; D011863:Radioimmunoassay / Q000379:methods*
chemical_list: D009020:Morphine