title: [Enkephalin metabolism in human serum; serum Leu-enkephalin concentration in patients with acute and chronic pain].
mesh_terms: D000328:Adult; D001416:Back Pain / Q000097:blood; D004743:Enkephalin, Leucine / Q000097:blood*; D005260:Female; D006562:Herpes Zoster / Q000097:blood; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000097:blood*; D010149:Postoperative Pain / Q000097:blood
chemical_list: D004743:Enkephalin, Leucine