using an immunoperoxidase technique , a series of 13 extragonadal germ cell tumors were screened for the presence of 7 different antigens : human chorionic gonadotropin , beta-subunit ( beta-hcg ) , pregnancy-specific beta 1-glycoprotein ( sp1 ) , human placental lactogen ( hpl ) , carcinoembryonic antigen ( cea ) , alpha-fetoprotein ( afp ) , alpha 1-antitrypsin ( alpha-at ) and ferritin .
C0018062
human chorionic
C0106132
beta-hcg