Biotinylated SARS-CoV-2 Spike RBD (S477N, E484K), His,Avitag (SPD-C82Ef) is expressed from human 293 cells (HEK293). It contains AA Arg 319 - Lys 537 (Accession # QHD43416.1 (S477N, E484K)). The mutations (S477N, E484K) were identified in the SARS-Co 1 * 25 µG