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Comparison of RBD-specific antibody responses from sera of mice vaccinated with either NP/RBD or exRBD (amino acids 319–528). (A) Mouse vaccination regimen. (B) Coomassie blue stain (left) and Western blot (right) of purified exRBD 6xHis (amino acids 330–528) (LD = protein ladder). (C) ELISA analysis of RBD-specific IgG antibody levels in sera on Day 14 after vaccination (n = 5/group).
