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SARS-CoV-2 S1 protein, Fc Tag (S1D-C5256) is expressed from human 293 cells (HEK293). It contains AA Val 16 - Arg 685 (Accession # QHD43416.1). The mutations (L18F, D80A, D215G, LAL242-244del, R246I, K417N, E484K, N501Y, D614G) were identified in the SARS-CoV-2 Beta variant (Pango lineage: B.1.351; other names: 20H/501Y.V2).