PRIMITIVE HUMAN blood cells, known as hematopoietic precursor cells, were produced from human embryonic stem cells by researchers at the University of Wisconsin, led by James A. Thomson. Similar work has been done in mice, but this is the first time human blood cells have been developed from embryonic stem cells, said Dan S. Kaufman, one of the authors of the study appearing in Tuesday?s issue of Proceedings of the National Academy of Sciences. Embryonic stem cells are the basic building blocks for the 260 or so cell types in the body. During development, stem cells transform into heart, muscle, brain, skin or other tissue.
http://www.msnbc.com/news/623437.asp
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