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{{merge|Embryonic stem cells}}'''Embryonic stem cell ''' research is the utilization of [[stem cells|stem cells]] from embyros [[embryo]]s which can then be grown in a laboratory culture and produce specialized cells supposedly to treat diseases [[disease]]s or used for research purposes. A The most common source of such cells is discarded embryos at [[fertility clinicsclinic]]s - the process of [[IVF]] typically produces two or three 'leftover' embryos for each treatment, which are usually discarded. The use of embryonic stem cells in medicine has met with some controversy, particularly from the [[pro-life ]] movement that is concerned about the destruction of embryos that they believe constitute human liveslife.[http<ref>https://www.washingtonpost.com/wp-dyn/content/article/2005/07/29/AR2005072900158.html] </ref>
'''Adult stem cell ''' research is similar except it does not use or destroyed embryos, and instead is based on stem cells that can be taken from adults. These cells so far have proven are less potent versatile than those harvested from discarded embryos, but they do not raise the associated [[ethics|ethical dillemas]] dilemmas.[http://www.isscr.org/Unfortunately, adult embryonic stem cells are of little value to science/faqas a whole.htm]