the placental proteins human chorionic gonadotrophin ( hcg ) , human placental lactogen ( hpl ) , pregnancy-specific beta 1-glycoprotein ( sp1 ) , and pregnancy-associated plasma protein a ( papp-a ) were quantified in these media as well as in the placental tissue before and after the perfusion .
C0032974
placental
C0033002
pregnancy-specific beta 1-glycoprotein