Abstract
Implantation is strictly dependent on the mutual interaction between a receptive endometrium
and the blastocyst. Hence, synchronization between blastocyst development and the
acquisition of endometrial receptivity is a prerequisite for the success of this process.
This review depicts the cellular and molecular events that coordinate these complex
activities. Specifically, the involvement of the sex steroid hormones, estrogen and
progesterone, as well as components of the immune system, such as cytokines and specific
blood cells, is elaborated.
Keywords
endometrium - immune cells - estrogen - progesterone - cytokines