title: Changes in the heterozygotes for pku and their possible relationship to the environment in utero.
mesh_terms: D001921:Brain / Q000196:embryology; D005260:Female; D005808:Genes, Recessive; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D008431:Maternal-Fetal Exchange; D010661:Phenylketonurias / Q000150:complications / Q000196:embryology*; D011247:Pregnancy; D011296:Prenatal Diagnosis