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**FILE** In this Oct. 22, 2008 photo, Theresa Gratsch, a Ph.D. research specialist, views nerve cells derived from human embryonic stem cells under a microscope at the University of Michigan Center for Human Embryonic Stem Cell Research Laboratory in Ann Arbor, Mich. (Associated Press)
Photo by: Paul Sancya
**FILE** In this Oct. 22, 2008 photo, Theresa Gratsch, a Ph.D. research specialist, views nerve cells derived from human embryonic stem cells under a microscope at the University of Michigan Center for Human Embryonic Stem Cell Research Laboratory in Ann Arbor, Mich. (Associated Press)

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