Complete description: Stem cells serve as the source of all the other specialized cells in the body, both when it forms during embryogenesis and when it replaces cells that have been lost to aging, injury or disease.
Complete description: Subscribe for daily health news. Like/Dislike, Favorite, Comment, Embed on Blog, Facebook Share, and Tweet this video. Get the word out on this video. - Monday May 23 2011 12:20 am en.wikipedia.org He