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In vitro microneutralization assay of mouse sera against live SARS-CoV-2 in the Vero E6 cell line immunized with plant-produced gRBD or dRBD. In the assay, 32 to 1024 dilutions of the sera were used. Statistical significance (p < 0.05) was calculated using the one-way ANOVA test. ** p < 0.01; *** p < 0.001; n = 6 mice/group.
