1.   Although sperm has been frozen for years, and frozen embryos are now used routinely in infertility treatments, freezing delicate human eggs has bedeviled scientists.

2.   At New York Hospital-Cornell Medical Center, Dr. James Griffo, the director of reproductive endocrinology, has thousands of frozen embryos.

3.   Before human cloning becomes as acceptable as implanting frozen embryos, all kinds of moral and legal dilemmas would have to be dealt with.

4.   Boston IVF, a group of fertility clinics based in Waltham, Mass., recently agreed to supply Harvard researchers with frozen embryos for stem cell research.

5.   Boston IVF, an organization of fertility clinics based in Waltham, Mass., said it has thousands of frozen embryos that could provide stem cells.

6.   A number of these lawmakers generally favor stem cell research on frozen embryos, but have drawn the line at therapeutic cloning.

7.   A frozen embryo.

8.   Brinkley said Congress should bring forth legislation to allow the inclusion of existing frozen embryos that would be discarded otherwise.

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

10.   Bush has wrestled with whether to approve federal funding for the controversial research on frozen embryos, which scientists say holds the key to curing or treating many diseases.