[1] Univ Calif San Francisco, Div Allergy & Immunol, 400 Parnassus Ave, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Dept Neurol, San Francisco, CA USA
[3] Univ Calif San Francisco, Dept Ophthalmol, San Francisco, CA USA
[4] Univ Calif San Francisco, Dept Biochem & Biophys, San Francisco, CA 94143 USA
[5] Howard Hughes Med Inst, Chevy Chase, MD USA