1.   Because of problems with using human egg cells, Advanced Cell Technology has been working with cow eggs.

2.   A cow egg stripped of its nucleus would be fused with a human cell to create a nonviable cloned embryo, from which embryonic stem cells would be taken.

3.   ACT officials said last November that they had combined adult human cells with cow eggs that had been stripped of their nucleus.

4.   After stuffing every cow egg with its little spud of human DNA, Sawyer prepares the next step.

5.   Dr. Matalipova works at a microscope, using a sharp pipette to remove genetic material from a cow egg.

6.   Factors in the cow egg are thought to make the human cell nucleus revert to its embryonic form.

7.   Lonza said that recently, Dr. Neil First of the University of Wisconsin formed hybrid embryos using denucleated cow eggs and nuclei from mice, monkeys and other animals.

8.   Researchers get thousands of cow eggs from slaughterhouses, Page said.

9.   So they added cells that were dividing normally to unfertilized cow eggs whose own genetic material had been removed.

10.   So far, Boisellier said, the Clonaid scientists have practiced emptying the genetic instructions from cow eggs, in preparation to do the same in humans.