the alpha subunit of human chorionic gonadotropin ( alpha-hcg ) , human chorionic gonadotropin ( hcg ) and alpha fetoprotein ( afp ) were measured in the serum of 25 women with chromosomally abnormal fetuses between 18 and 25 weeks of gestation and in 74 normal pregnancies .
C0017963
alpha subunit
C0018062
human chorionic