[1] Ctr Dis Control & Prevent, Influenza Div, Atlanta, GA 30333 USA
[2] Scripps Res Inst, Dept Physiol Chem, La Jolla, CA 92037 USA
[3] Scripps Res Inst, Skaggs Inst Chem Biol, La Jolla, CA 92037 USA
[4] Scripps Res Inst, Consortium Funct Glyc, La Jolla, CA 92037 USA