Difference between revisions of "Embryonic stem cells"
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Embryonic stem cells can differentiate into the three "germ layers": [[ectoderm]], [[endoderm]] and [[mesoderm]]. The 220 types of cells in humans are all based on these germ layers. Some scientists, particularly those having pro-choice political views, claim that embryonic stem cells can differentiate better, and divide into greater numbers, than [[adult stem cells]] can. | Embryonic stem cells can differentiate into the three "germ layers": [[ectoderm]], [[endoderm]] and [[mesoderm]]. The 220 types of cells in humans are all based on these germ layers. Some scientists, particularly those having pro-choice political views, claim that embryonic stem cells can differentiate better, and divide into greater numbers, than [[adult stem cells]] can. | ||
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Revision as of 16:50, March 31, 2007
Embryonic stem cells are taken from the inner part of a young embryo, also known as a blastocyst. An embryo reaches the blastocyst stage about 4-5 days after fertilization. At that point they contain about 50-150 cells.
Embryonic stem cells can differentiate into the three "germ layers": ectoderm, endoderm and mesoderm. The 220 types of cells in humans are all based on these germ layers. Some scientists, particularly those having pro-choice political views, claim that embryonic stem cells can differentiate better, and divide into greater numbers, than adult stem cells can.
