1 Center for Immunobiology and Vaccine Development, University of California San Francisco Benioff Children's Hospital Oakland Research Institute, Oakland, California, USA deborah.dean@ucsf.edu.
2 Department of Bioengineering, University of California Berkeley and University of California San Francisco Joint Graduate Group, Berkeley and San Francisco, California, USA.
3 Department of Medicine and Pediatrics, University of California, San Francisco, California, USA.
4 Center for Immunobiology and Vaccine Development, University of California San Francisco Benioff Children's Hospital Oakland Research Institute, Oakland, California, USA.
5 Department of Pharmaceutical Chemistry, University of California, San Francisco, California, USA.