title: Transient defect in the synthesis of biopterin.
mesh_terms: D001708:Biopterins / Q000096:biosynthesis*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D010661:Phenylketonurias / Q000378:metabolism*; D011621:Pteridines / Q000096:biosynthesis*
chemical_list: D011621:Pteridines; D001708:Biopterins