Up until now, most embryonic research has been conducted on leftover embryos from invitro-fertilization. The new rules mean that researcher can now growing human embryos “under strict and limited conditions” for scientific research.
Of that number, only 50% can be implanted into the womb of the egg donor. Even after that, only 50% make it past 3 months. To put that in numbers, of 100 ovum used in invitro-fertilization, only 13 ever have the potential to become babies.