NPR's Robert Siegel talks to Dr. Zach Hall about stem cell research. Hall is the former head of the National Institute of Neurological Disorders and Stroke at the NIH, and first president of the California Institute for Regenerative Medicine, the state-funded stem cell research facility. He explains the difference between embryonic and adult stem cells, and why they are not interchangeable.
http://www.npr.org/templates/story/story.php?storyId=129406274
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