This is largely due to the technique used in creating them . At present , there are two methods of developing embryonic cell lines that will be used for research : isolation of stem cells directly from an embryo , which necessitates the destruction of the embryo where the stem cells are harvested and cell nuclear transfer , also known as embryo-cloning (Stevens , 2003 . Cloning , the second method employed to develop embryonic stem cells is in itself already a controversial issue .Stem Cell Research page_...
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