胚胎植入是指胚胎进入子宫腔后与子宫内膜黏附、并且埋植于其中的过程。胚泡发育与子宫内膜必须协调同步,并于子宫内膜着床窗开放时期相互识别,着床才会成功。调控胚胎着床的机理十分复杂,与之相关的因素较多,包括雌孕激素、细胞因子、黏附分子、免疫因子、酶等。近年来,趋化性 Embryo implantation refers to the embryo into the uterine cavity and endometrial adhesion, and embedded in the process. The development of blastocyst and endometrium must be coordinated and synchronized, and identify each other during the opening of endometrial implantation window, implantation will be successful. The mechanism of regulating embryo implantation is very complex, with many related factors, including estrogen and progesterone, cytokines, adhesion molecules, immune factors, enzymes and so on. In recent years, chemotaxis