Table 1.

Quantitative analysis of hPL mRNA in the placenta, maternal plasma, and cord plasma

Sample	Placental tissues, copies/pg		Maternal plasma, copies/ml		Cord plasma, copies/ml
	hPL	GAPDH	hPL	GAPDH	hPL	GAPDH
1	62,026,500	290	288,470	171	0	413
2	14,739,140	100	119,850	58	0	450
3	78,966,310	310	152,080	143	0	420
4	61,374,600	220	24,050	83	0	300
5	59,118,610	340	83,440	56	0	356
6	90,956,480	260	104,600	139	0	619

Values are given as copies per ml of plasma, except for the values of hPL and GAPDH in placental tissues, which are given as copies per pg of total placental RNA.