Recombinant SARS-CoV-2 Spike protein S1 subunit, encompassing amino acids 16-685. This protein corresponds to SARS-CoV-2 Variant P.1, also known as variant Gamma originally identified in Brazil, and contains the ten mutations listed below. The construct contains a C-terminal Avi-Tag™ followed by a His-tag (6xHis). The protein was affinity purified.