SARS-CoV-2 Spike RBD, His Tag (SPD-C5221) is expressed from human 293 cells (HEK293). It contains AA Arg 319 - Lys 537 (Accession # QHD43416.1 (R346K, E484K, N501Y)). The mutations R346K, E484K, N501Y were identified in the SARS-CoV-2 Mu variant (Pan 1 * 1 mg