Avian Influenza: A Hole In One Cavity in N1 enzyme of H5N1 flu virus could be exploited for new flu drugs <A HREF="http://pubs.acs.org/cen/news/84/i34/8434notw6.html" target="_blank">http://pubs.acs.org/cen/news/84/i34/8434notw6.html</A>