Fig 1: mRNA expression.qPCR analysis of placental biopsies from the maternal (black bars) and foetal side (white bars) of 12 healthy and seven PE placentas. Data (mean ± SEM) are expressed as fold change versus the maternal side biopsies of healthy controls. Panels a-d represent data for eNOS, iNOS, PDE5A and PDE1A. *p < 0·05; **p < 0·01 (Mann-Whitney U test or Wilcoxon matched pairs test).