title: Reply to SP Bessman.
authors.forename: H L
authors.initials: HL
authors.lastname: Levy
mesh_terms: D004032:Diet; D005260:Female; D006801:Humans; D010649:Phenylalanine / Q000008:administration & dosage; D010661:Phenylketonurias / Q000188:drug therapy*; D011247:Pregnancy; D011248:Pregnancy Complications; D014443:Tyrosine / Q000627:therapeutic use*
chemical_list: D014443:Tyrosine; D010649:Phenylalanine