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Reactivity of M1A to S protein determined by ELISA. s + M1A, plates were coated with recombinant S protein as an antigen to test the reactivity of M1A. BSA + M1A or E6 + M1A, plates were coated with BSA (1 mg/ml) or Vero E6 cell lysates, respectively, as a negative antigen control to test the cross-reactivity of M1A. OD450, optical density at 450 nm.
