PEX1 and GATAD1 mRNA levels in first-trimester (1N, n=8), third-trimester normal (3N, n=14) and third-trimester preeclamptic (3P, =7) placentas. Real-time PCR were performed as described in Materials and methods. Data were standardized by the results from β-actin internal control. The mRNA levels from third-trimester normal (3N) placentas were set as 1. The averages and standard errors of each group were presented. a PEX1 mRNA levels. No significant difference was found between 1N and 3P, or 3N and 3P groups. b GATAD1 mRNA levels. Significantly higher GATAD1 mRNA levels were observed in 3N than in 1N; A significant reduction of GATAD1 mRNA levels were found in 3P compared to 3N group. **p < 0.01.