Embryonic regulation in implantation

Maternal steroid hormones play a critical role in establishing the receptiv e phase of implantation. In addition to that, the embryo is able to modulat e endometrial molecules during the apposition phase (chemokines) and the ad hesion phase (adhesion and anti-adhesion molecules). Moreover, the human em bryo also exerts a coordinated regulation of endometrial epithelial apoptos is during these implantation phases. In this work, we analyze the embryonic regulation of implantation in humans using an in vitro model.