[1] Univ Washington, Dept Med, Div Allergy & Infect Dis, Seattle, WA 98105 USA
[2] Univ Washington, Dept Chem, Seattle, WA 98195 USA
[3] Univ Washington, Dept Biochem, Seattle, WA 98195 USA
[4] Seattle Biomed Res Inst, Seattle, WA 98109 USA
[5] Univ Washington, Dept Global Hlth, Seattle, WA 98195 USA