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Many [[liberals]], on the other hand, claim that the embryos used for stem cell research are already condemned to death because most of them are the byproduct of [[in vitro fertilization]] procedures which generate many more embryos than are needed to implant in the woman. With no further use for these embryos, they are often destroyed. Thus, liberals claim that embryonic stem cell research does not result in the destruction of any additional embryos. <ref>http://humrep.oxfordjournals.org/cgi/content/full/18/4/672</ref> Conservative argue that this reasoning fails to mention that embryos can be adopted within the 10 year window of viability <ref>http://www.embryoadoption.org/</ref> and thus saved from destruction.

Many [[liberals]], on the other hand, claim that all the embryos used for stem cell research are already condemned to death because most of them are the byproduct of [[in vitro fertilization]], a procedure that requires the production of a number of embryos far in excess of the number that are successfully implanted. Few parents choose to cryogenicaly store these excess embryos, and with no further use for these embryos, they are often destroyed. Thus, liberals claim that embryonic stem cell research does not result in the destruction of any additional embryos. <ref>http://humrep.oxfordjournals.org/cgi/content/full/18/4/672</ref> Conservatives argue that unused embryos can be adopted within a 10 year window of viability <ref>http://www.embryoadoption.org/</ref> and thus saved from destruction; however, embryo adoption is very rare and far too few prospective adoptive parents exist for all unused embryos to be adopted.

==References==

==References==