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Binding activity of anti-receptor-binding domain (RBD) polyclonal antibodies (pAbs) with various severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) mutant RBDs. (A) Binding of angiotensin-converting enzyme 2 (ACE2) to immobilized RBDs from wild-type (WT) SARS-CoV-2 and mutants. (B) Binding of anti-RBD pAbs with WT and mutant SARS-CoV-2 RBDs.
