ELN - Tysabri is on center stage as FDA debates balance between speed and safety <A HREF="http://money.cnn.com/2006/02/23/news/companies/tysabri/index.htm?source=yahoo_quote" target="_blank">http://money.cnn.com/2006/02/23/news/companies/tysabri/index.htm?source=yahoo_quote</A>