Molecular aspects of implantation: The signals and molecular pathways involved in implantation, a symbiotic interaction between blastocyst and endometrium involving adhesion and tissue invasion

Implantation is a complex process requiring the interactionof the blastocyst, and subsequently the developing embryo withthe endometrium. Initially, the detailed cellular interactionsimplicated in this process were defined. More recently, manysignals and molecular pathways are recognized that induce, orregulate the complex series of interactions required for implantation.In this review, the cellular and molecular interactions thattake place during implantation are discussed.