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Recombinant SARS-CoV-2 Spike protein in its homotrimeric form, containing S1+S2 subunits and encompassing amino acids 16-1213. This protein contains mutations 682RRAR685>A, K986P and V987P. The construct also contains a C-terminal His tag (6xHis). The recombinant protein was affinity purified and labeled with trFluor-Eu.