And Congress has imposed a ban on experimenting with human embryos.

Case study two: a woman wants to become pregnant with frozen embryos.

The test may start with eggs, embryos, or juveniles and last from 7 to 200 days.

The researchers worked only with abnormal embryos, which never would have developed into babies.

To develop the method, research with human embryos was required.

Six months later we tried again with frozen embryos from the previous treatment.

After a failed attempt at pregnancy, she tried again with frozen embryos from the same place, and their daughter was born in August.

"We're not doing any research with embryos," he had said lamely, trying to keep his voice steady.

Once again, the committee repeats that a human being becomes one at the moment of conception, and allows science to work only with dead embryos.

But a woman with frozen embryos can become pregnant in middle age, or even beyond.