It's interesting to compare the ^NBI (Biotech Index) with the ^BPI (Biopharm Index). <A HREF="http://finance.yahoo.com/q/bc?s=%5EBPI&t=1y&l=on&z=m&q=l&c=%5ENBI" target="_blank">http://finance.yahoo.com/q/bc?s=%5EBPI&t=1y&l=on&z=m&q=l&c=%5ENBI</A> They are similar (although the ^NBI generally underperforms) until February, when there is a larger divergence, with the ^NBI falling. Any theories as to the cause of the divergence?