Difference between revisions of "Embryonic stem cells"
(reverted to previous version - fix vandalism) |
|||
| Line 1: | Line 1: | ||
'''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''' 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 | + | 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 have shown effectively that embryonic stem cells have greater differentiation potential, and divide into greater numbers, than [[adult stem cells]] can. |
[[Pro-life]] conservatives consider taking stem cells from human embryos, as tantamount to [[abortion]], which they believe to be a hideous and [[evil]] practice. President Bush was pressured by [[Liberal]] [[Scientist]]s into funding stem cell research[http://www.whitehouse.gov/news/releases/2001/08/20010809-2.html]. | [[Pro-life]] conservatives consider taking stem cells from human embryos, as tantamount to [[abortion]], which they believe to be a hideous and [[evil]] practice. President Bush was pressured by [[Liberal]] [[Scientist]]s into funding stem cell research[http://www.whitehouse.gov/news/releases/2001/08/20010809-2.html]. | ||
[[category:biology]] | [[category:biology]] | ||
Revision as of 06:17, May 23, 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 have shown effectively that embryonic stem cells have greater differentiation potential, and divide into greater numbers, than adult stem cells can.
Pro-life conservatives consider taking stem cells from human embryos, as tantamount to abortion, which they believe to be a hideous and evil practice. President Bush was pressured by Liberal Scientists into funding stem cell research[1].
