title: Circadian change in rat pineal tryptophan content: lack of correlation with serum tryptophan.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism; D002940:Circadian Rhythm; D008297:Male; D009928:Organ Specificity; D010870:Pineal Gland / Q000378:metabolism*; D051381:Rats; D014364:Tryptophan / Q000097:blood / Q000378:metabolism*
chemical_list: D014364:Tryptophan