title: Endogenous opioids in cerebrospinal fluid and blood in idiopathic headache sufferers.
mesh_terms: D000328:Adult; D003027:Cluster Headache / Q000378:metabolism; D004723:Endorphins / Q000032:analysis* / Q000097:blood / Q000134:cerebrospinal fluid; D004745:Enkephalins / Q000032:analysis* / Q000134:cerebrospinal fluid; D005260:Female; D006261:Headache / Q000097:blood / Q000134:cerebrospinal fluid / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008881:Migraine Disorders / Q000378:metabolism; D014364:Tryptophan / Q000032:analysis* / Q000097:blood / Q000134:cerebrospinal fluid
chemical_list: D004723:Endorphins; D004745:Enkephalins; D014364:Tryptophan