1.   Because harvesting stem cells usually requires destruction of embryos left over from in vitro fertilization procedures, antiabortion groups oppose it vigorously.

2.   But opponents of abortion, including many members of Congress, object to the federal financing of any research that requires the destruction of a human embryo.

3.   Even so, religious conservatives oppose using embryos as a source of the cells because that requires the destruction of what they deem a nascent form of life.

4.   If a deal is signed, it would be the first nuclear arms reduction pact to actually require the destruction of existing warheads.

5.   In particular, they explored the differences between sanctioning work on embryos that have already been destroyed, as opposed to supporting research that would require new destruction.

6.   India wanted the treaty to require the destruction of all existing nuclear weapons within a given time period.

7.   That policy, which requires the destruction of certain records, was cited by Andersen executives in the rush to shred documents last fall.

8.   The agreement that Bush and Russian President Vladimir Putin will sign, however, will not require the destruction of a single weapon.

9.   The embryos are destroyed in the process of obtaining the cells, and Bush said he would not support research that required further destruction of embryos.

10.   The fate of the treaty, which would also require the destruction of existing chemical weapons, is very much in doubt.