Ma, X., Zou, F., Yu, F., Li, R., Yuan, Y., Zhang, Y., … Zhang, H. (2020). Nanoparticle Vaccines Based on the Receptor Binding Domain (RBD) and Heptad Repeat (HR) of SARS-CoV-2 Elicit Robust Protective Immune Responses. Immunity, 53(6), 1315-1330.e9. https://doi.org/10.1016/j.immuni.2020.11.015 (Original work published 2020)