1Product Development Group, Infectious Disease Research Institute, Seattle, WA, USA.
2RNA Vaccines Group, Infectious Disease Research Institute, Seattle, WA, USA.
3Formulation Sciences Group, Infectious Disease Research Institute, Seattle, WA, USA.
4Departments of Medicine and Global Health, University of Washington, Seattle, WA, USA.
5Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.
