1.   Pluripotent stem cells are the master cells from which all body tissue develops.

2.   At issue are embryonic master cells that can generate all the other tissues of the body.

3.   At issue are the master cells found in embryos that can generate all the other tissues of the body.

4.   Embryonic stem cells, or ES cells, are master cells formed early in development.

5.   Embryonic stem cells are the master cells for development.

6.   Embryos contain master cells called stem cells that have the potential to grow into any tissue in the body.

7.   Neither experiment has yet produced the coveted stems cells, master cells which grow into all kinds of body tissues.

8.   Neither experiment was found to produce the master cells known as stem cells, which differentiate into other body tissues.

9.   Neither experiment were found to produce the master cells known as stem cells, which differentiate into other body tissues.

10.   Scientists and universities are increasingly worried because the Bush administration apparently will block federal financing of promising medical research using certain master cells.