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Figure 1. Blastocyst Apposition and Adhesion. The diagram shows a preimplantation-stage blastocyst (approximately six to seven days after conception) and the processes thought to be necessary for uterine receptivity and blastocyst apposition and adhesion. COX-2 denotes cyclooxygenase-2, EGF epidermal growth factor, and LIF leukemia inhibiting factor.
Figure 2. Blastocyst Implantation. The diagram shows an invading blastocyst (about 9 to 10 days after conception) and the processes necessary for trophoblast invasion.
Figure 3. Maintenance of Early Pregnancy. The diagram shows an implanted embryo (approximately 14 days after conception) and the processes necessary for the maintenance of an early pregnancy. VEGF denotes vascular endothelial growth factor, and hCG human chorionic gonadotropin.