title: Letter: Racial differences in maternal serum-alpha-fetoprotein.
mesh_terms: D044383:Black People; D005260:Female; D005326:Fetal Proteins / Q000032:analysis*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014481:United States; D044465:White People; D000509:alpha-Fetoproteins / Q000032:analysis*; D001741:Black or African American
chemical_list: D005326:Fetal Proteins; D000509:alpha-Fetoproteins