giving rise to virtually any cell type. Research on these primordial cells will also provide a unique opportunity to study human cell biology. Adult stem cells, obtained from mature tissues, differentiate into a narrower range of cell types. As a

Cell Lines Cultures of disaggregated tissue that can be maintained and propagated for use in research. Cells in the same line are typically clones. The length of time cells will survive in culture varies. Some cell lines

the Sources of Stem Cells At present, there are three possible sources of stem cells: adult stem cells derived from pediatric or adult donors; embryo germ cell stem cells (EG cells ) derived from aborted fetuses; and embryonic stem

sources. Embryonic stem cells (ES cells ) derived from early embryos and embryonic germ cells (EG cells) have particular promise for a wide range of therapeutic applications because they are capable of giving rise to virtually any cell type.

prohibited....However, human cells derived from cloning techniques, from ES cell lines, or from primordial germ cells should not be precluded from use in approved research activities in cellular and developmental biology Here two things are

them the name “stem cell of the body”). ES cells can also differentiate into many cell types in tissue culture, including neurons, blood cells and cardiac and skeletal muscle. The normal embryo has about 100 cells with the properties

? Would the pluripotent hES cell be considered a potential person if we could discover how to turn on its trophoblast genes and make a placenta? Would these questions apply as well to hEG cells taken from an aborted fetus ? Even if pluripotent

funding for pluripotent stem cell research but deny it for deriving these stem cells from embryos. "DHHS funds may not be used for the derivation of human pluripotent stem cells from early human embryos." What, then, should be the

funds for research on stem cell lines derived from embryos before August 9, but not after. His reason of course is that funding for cells derived after that date may be an incentive for more embryos to be destroyed. This limit rests upon the

three different fibroblast cell lines Treatment n Cleavage (%) Blastocyst (%) Control 936 585 (63) 178 (19) CL1 3713