title: Letter: Plasma-tryptophan and oral contraceptives.
mesh_terms: D001921:Brain / Q000378:metabolism; D003276:Contraceptives, Oral / Q000009:adverse effects / Q000494:pharmacology*; D003863:Depression / Q000097:blood / Q000139:chemically induced* / Q000378:metabolism; D005260:Female; D006801:Humans; D012701:Serotonin / Q000378:metabolism; D014364:Tryptophan / Q000097:blood* / Q000378:metabolism
chemical_list: D003276:Contraceptives, Oral; D012701:Serotonin; D014364:Tryptophan