Recombinant SARS-CoV-2 (Omicron B.1.1.529) Spike Receptor Binding Domain (RBD) with mutations F375S and A484E, Avi-His Tag. Used in vaccine development and antiviral research to study immune response against the Omicron variant. Enables testing of neutralizing antibodies and evaluation of vaccine efficacy. The Avi-His tag facilitates immobilization on biosensors and purification, making it suitable for ELISA, surface plasmon resonance, and other binding assays. Supports diagnostic tool development and therapeutic antibody screening.