The process of implantation and trophoblast invasion is currently considered as the most
limiting factor for the establishment of pregnancy. Molecular interactions at the embryo–
maternal interface during the time of adhesion and subsequent invasion are crucial to the
process of embryonic implantation. Both partners, the mother as well as the embryo, play
equal roles in the embryo–maternal dialogue, the embryonic part being the main topic in this
study. Investigations of the proteins in the extra-embryonic matrices (ie zona pellucida) …