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Hypermethylated IGF-1 promoter in preeclamptic placentas by pyrophosphate sequencing. A. Representative pyrosequencing images in NP and PE groups. B. The degree of DNA methylation of IGF-1 promoter at CpG_1 and CpG_2. Data were presented as Mean ± SD. **P<0.01. NP refers to normal pregnancy, PE refers to preeclampsia.
