title: A developmental study of substance-P, somatostatin, enkephalin, and serotonin immunoreactive elements in the spinal cord of the North American opossum.
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000378:metabolism; D004745:Enkephalins / Q000378:metabolism*; D005455:Fluorescent Antibody Technique; D007124:Immunoenzyme Techniques; D009893:Opossums / Q000254:growth & development* / Q000378:metabolism; D012701:Serotonin / Q000378:metabolism*; D013116:Spinal Cord / Q000254:growth & development* / Q000378:metabolism; D013373:Substance P / Q000378:metabolism*
chemical_list: D004745:Enkephalins; D012701:Serotonin; D013373:Substance P