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Schematic of the C57BL/6 mice immunization with SARS-CoV-2 vaccines. (A) Immunization groups and doses for the plasmid (p)DNA vaccines. All immunizations were received intramuscularly with 100 ug per dose, except the phosphate-buffered saline (PBS) control group. (B) The bleeding and immunization regime for the C57BL/6 mice.
