Some compare the bill's stipulations about using leftover embryos to financing deadly research experiments on death row inmates.

IN that case, the couple had not signed a contract specifying what should be done with the leftover embryos.

The embryonic stem cells studied so far have been derived from the leftover embryos generated in fertility clinics.

But at least half the time there are leftover embryos.

At one time, embryonic stem cell research involved only leftover frozen embryos created for people trying in-vitro fertilization.

One of the best sources of human stem cells is the many leftover frozen embryos from fertility clinics.

The result was not only the absence of better techniques toeliminate excess or leftover embryos, but also the absence of the broadest possible debate on the ethical ramifications.

Today there are 400,000 leftover frozen embryos.

Take their leftover embryos, and instead of discarding the ones with Anton's Key, he'd keep them all and raise them and study them.

And, just as routinely, many have leftover embryos, which are frozen and stored.