Specific fertilization and embryo implantation?

Delayed embryo implantation (embryonic diapause) obviates the need to come ashore (haul out) to twice a year, once to give birth and again to mate.

It is responsible for the thickening of the iterine lining in preparation for embryo implantation.

In mice, pregnancy can only be terminated prior to embryo implantation, but other species will interrupt even a late-term pregnancy.

As the corpus luteum can no longer release progesterone, the uterus remains unprimed for embryo implantation, and the pregnancy fails.

Martin Evans and Matthew Kaufman reported a technique that delays embryo implantation, allowing the inner cell mass to increase.

Trophoblasts are specialized cells of the placenta that play an important role in embryo implantation and interaction with the decidualised maternal uterus.

Within the next decade, researchers will be able to screen for almost all congenital illnesses prior to embryo implantation.

(The proliferative dose is the dose that produces full endometrial cell growth, as in preparation for embryo implantation).

This may also make it more difficult for embryo implantation to occur.