the production of human chorionic gonadotropin ( hcg ) , pregnancy-specific beta-1 glycoprotein ( sp1 ) , and the various placental tissue proteins ( pp4 , pp5 , pp10 , pp11 , pp12 , mp1 ) was examined in human choriocarcinoma cell lines using radioimmunoassay ( ria ) and an immunoperoxidase ( pap ) staining method .
C0033002
pregnancy-specific beta-1
C0032974
placental