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" ... The second mutation of interest occurs at amino acid 484. Many of the variants of concern, including the B.1.351, P.1, and B.1.526 variants, substitute glutamic acid for lysine (E484K), which is a substitution of a negatively charged for a positively charged amino acid. This change reduces neutralization by convalescent antisera and binding of some monoclonal antibodies and increases the affinity for ACE2. ... "