WNT4 and preeclampsia: Enriched pathways play a role in decidualization (e.g. ‘Wnt Signaling’, ‘BMP Signaling’, ‘ErbB Signaling’, ‘TGF-beta Receptor Signaling’ and ‘BMP2-WNT4-FOXO1 Pathway in Human Primary Endometrial Stromal Cell Differentiation’), as well as in placental bed development disorders and preeclampsia, the induction of pro-inflammatory factors via nuclear factor-κB (NFκB), mediation of maternal immunotolerance to the fetal allograft, circadian rhythm in association with implantation and parturition, and the decidual inflammation, senescence, and parturition.