title: Plasma and platelet methionine-enkephalin levels in chronic cluster patients during an acute headache episode.
mesh_terms: D000208:Acute Disease; D000328:Adult; D001792:Blood Platelets / Q000378:metabolism*; D003027:Cluster Headache / Q000097:blood*; D004744:Enkephalin, Methionine / Q000097:blood*; D006801:Humans; D008875:Middle Aged; D014653:Vascular Headaches / Q000097:blood*
chemical_list: D004744:Enkephalin, Methionine