1.   But Bush and many others have moral qualms about the research, because the cells are extracted from human embryos that are destroyed in the process.

2.   But extracting the cells requires destroying the embryos, which are typically left over from in vitro fertilization attempts.

3.   But the research leaves some people deeply uneasy because the embryos are destroyed when the cells are extracted.

4.   But, in the process of extracting the cells, the blastocyst is destroyed.

5.   Doctors then thread a tiny catheter into the milk duct, wash the duct with saline solution and extract cells.

6.   Researchers first extracted cells from the udder of the ewe, then extracted the nucleus of the cells, which contains the genetic blueprint.

7.   Stem cell research is opposed by antiabortion activists because extracting the cells from embryos left over from in-vitro fertilizations destroys the embryos.

8.   Such cells are typically extracted from excess embryos created by in vitro fertilization at fertility clinics, embryos that would otherwise be discarded.

9.   The cells were extracted from blastocysts by colleagues in Singapore and derived in compliance with NIH guidelines.

10.   The cells are extracted from embryos so tiny they can fit on the tip of a needle.