1. Division of Cell Biology, La Jolla Institute for Immunology, La Jolla, CA 92037, USA.
2. Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA.
3. State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou 510006, China.
4. Nomis Center for Immunobiology and Microbial Pathogenesis & Waitt Advanced Biophotonics Center, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.