Stem cells are classified into four types based on their origin, stem cells from embryos; stem cells from the fetus; stem cells from the umbilical cord; and stem cells from the adult. Each of the four types can be grouped into subtypes. Embryonic cells are derived from embryos, and many are derived from embryos that have been fertilized in vitro and then donated for research.
These primitive cells that come from a five day pre-implantation embryo
that is capable of dividing without differentiating for a prolonged period in culture, and develops into the three primary germ layers. Fetal stem cells are primitive cell types found in the organs of fetuses.(Bongs...
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...o. The debate on this probably wont subside, people will always have ethical issues with this, but if stem cell research is successful, the eventual result will be good for humans.
Bongso, Ariff (Editor); Lee, Eng Hin (Editor). Stem Cells : From Bench to Bedside.
Herold, Eve; Daley, George (Foreword by). Stem Cell Wars : Inside Stories from the Frontlines. Gordonsville, VA, USA: Palgrave Macmillan, 2006.
Insoo hyun, “Stem Cells” From the birth to death and bench to clinic the hastings center bioethics briefing book for journalists
In Stem Cell Information. Bethesda, MD: National Institutes of Health, U.S. Department of Health and Human Services, 2011
Parson, Ann B.. Proteus Effect: Stem Cells and Their Promise.
Washington, DC, USA: Joseph Henry Press, 2004.
River Edge, NJ, USA: World Scientific Publishing Company, Incorporated, 2005.
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