The righthand image shows the blastocyst "hatching" (D) from the protective zona pellucida, which it has to do in nature to implant in the uterus. By placing the hatched blastocyst onto a tissue ...

Around six to seven dpf, the blastocyst implants into the surface of the uterine wall and begins its expansion. 4 This area of the endometrium is transformed early on in pregnancy and acts as a fluffy ...