title: On the evolution of opioid mechanisms and immune defenses.
authors.affiliation: Biology Department, University of Puerto Rico, San Juan.
authors.forename: F L
authors.initials: FL
authors.lastname: Renaud
authors.forename: E Z
authors.initials: EZ
authors.lastname: Tomei
mesh_terms: D000701:Analgesics, Opioid / Q000494:pharmacology*; D000818:Animals; D005075:Biological Evolution; D002478:Cells, Cultured; D007111:Immunity, Cellular / Q000187:drug effects; D017737:Macrophages, Peritoneal / Q000276:immunology*; D051379:Mice; D009020:Morphine / Q000494:pharmacology*; D010587:Phagocytosis / Q000187:drug effects* / Q000276:immunology; D013768:Tetrahymena / Q000276:immunology*
chemical_list: D000701:Analgesics, Opioid; D009020:Morphine