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Indirect ELISA to identify the affinity of Nbs to SARS-CoV-2 S-RBD. (A) The binding affinity of Nbs to SARS-CoV-2 S-RBD (Wild Type); (B) the binding affinity of Nbs to SARS-CoV-2 S-RBD (Omicron); (C) the specificity of Nbs to SARS-CoV-2 S-RBD; commercial anti-SARS-CoV-2 RBD mAb was used as the positive control. The OD450 values were the means ± SD values from triplicate measurements.
