Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA. ykim@liai.org|Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA. ykim@liai.org|Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA. ykim@liai.org|Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA. ykim@liai.org|Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA. ykim@liai.org