IKBKG and preeclampsia: We hypothesize that the simultaneous existence of the same variant in the maternal and fetal NEMO gene may be associated with a higher risk of preeclampsia development We also would like to check whether the identified variant is associated with the level of NEMO gene expression (Total NEMO and 1A, 1B, 1C transcripts) in placentas and in fetal and maternal blood.