in a much wider segment of species than known to occur naturally.

General mechanism

Organisms which can stop their cellular division (embryonic diapause) can prevent an embryo from growing. Non-ideal reproductive conditions are what initiate this process, as delaying embryo maturation promotes survival of offspring and the parent.

Placental embryonic diapause in particular is an essential component of developmental progression in these species. This cessation is led by the intentional

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