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Biotinylated SARS-CoV-2 Spike RBD Protein (L452R, T478K), His,Avitag (SPD-C82Ed) is expressed from human 293 cells (HEK293). It contains AA Arg 319 - Lys 537 (Accession # QHD43416.1 (L452R, T478K)). The mutations L452R, T478K were identified in the SARS-CoV-2 Delta variant (Pango lineage: B.1.617.2; other names: 21A/S:478K).