title: Letter: Serum-aminoacids and brain tryptophan uptake.
mesh_terms: D000596:Amino Acids / Q000097:blood* / Q000494:pharmacology; D001921:Brain / Q000378:metabolism*; D006801:Humans; D014364:Tryptophan / Q000378:metabolism*
chemical_list: D000596:Amino Acids; D014364:Tryptophan