title: Heterozygote advantage--and disadvantage.
mesh_terms: D002648:Child; D005260:Female; D005333:Fetus / Q000201:enzymology; D006579:Heterozygote; D006801:Humans; D008431:Maternal-Fetal Exchange; D010651:Phenylalanine Hydroxylase / Q000172:deficiency; D010661:Phenylketonurias / Q000209:etiology / Q000235:genetics*; D011247:Pregnancy
chemical_list: D010651:Phenylalanine Hydroxylase