title: Plasma methionine enkephalin levels. A biological marker for migraine?
mesh_terms: D000293:Adolescent; D000328:Adult; D004744:Enkephalin, Methionine / Q000097:blood*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008881:Migraine Disorders / Q000097:blood / Q000175:diagnosis*
chemical_list: D004744:Enkephalin, Methionine