concentrations of four placental proteins : human placental lactogen ( hpl ) , placental protein 5 ( pp5 ) , pregnancy specific beta 1 glycoprotein ( sp1 ) and human chorionic gonadotrophin ( hcg ) , and a normal serum component , alpha 2 macroglobulin , were measured in the peripheral circulation and in blood obtained from the retroplacental space in 20 women at term delivery .
C0032974
placental proteins
C0033002
pregnancy specific beta 1 glycoprotein