title: Morphine-like factors in CSF of headache patients.
mesh_terms: D000328:Adult; D004723:Endorphins / Q000134:cerebrospinal fluid*; D004745:Enkephalins / Q000134:cerebrospinal fluid*; D005260:Female; D006261:Headache / Q000134:cerebrospinal fluid*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013997:Time Factors
chemical_list: D004723:Endorphins; D004745:Enkephalins