Growth factors could allow the use of neural stem cells for treating such diseases as Parkinson's
By Gabe Romain, Betterhumans Staff

Credit: Su-Chun Zhang/University of Wisconsin-Madison
Rebuilding minds: Neural stem cells can regenerate various brain cells, including neurons (red) and glial cells (green)

The discovery of a "fountain of youth" for brain stem cells could lead to their use for treating brain diseases such as Parkinson's.  

Source: http://www.betterhumans.com/News/news.aspx?articleID=2004-04-01-3