Table 4. mRNA expression of FOLR1, PCFT and RFC1 in full-term placental tissue and whole blood leukocytes.

	FOLR1	PCFT	RFC1
Placental tissue	1.0 × 10−5 ± 1.3 × 10−5	1.4 × 10−7 ± 8.5 × 10−8	5.0 × 10−6 ± 5.8 × 10−5
WBC	8.4 × 10−8 ± 1.2 × 10−8	7.4 × 10−6 ± 1.5 × 10−5	1.3 × 10−4 ± 2.9 × 10−4
Ratio placenta/WBC	119	0.02	0.04

The relative expression was calculated with the ΔCt method (2^^{-∆ Ct}), using 18S as the reference gene.