Embryonic stem cells (ES cells) are pluripotent stem cells derived from the inner cell mass of the blastocyst, an early-stage embryo.. Most embryonic stem cells are derived from embryos that develop from eggs that have been fertilized in vitro—in an in vitro fertilization clinic—and then donated for research purposes with informed consent of the donors. They are not derived from eggs fertilized in a woman’s body.
Because of their unique ability to generate so many different kinds of cells, and potential to reside in several areas of the human body, stem cells may eventually establish themselves as a cornerstone of 21st century medicine. Stem cell research has created an entirely new branch of medicine, called Regenerative Medicine. The specialty of this new discipline would be to repair organs or tissues affected or destroyed by age, disease or injury(More!)
Even though this is the case, a lot of controversy exists among the researchers, clinicians, politicians and the public centered on research involving the creation, usage and destruction of human embryos. Most commonly, this controversy focuses on embryonic stem cells. These ethical issues are together called Stem cell controversy. To make the research on stem cell more easy and unambiguous, National Institutes of Health has released some Guidelines on Human Stem Cell Research
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