Recombinant expressed and purified Omicron variant (mutations: G339D; S371L; S373P; S375F; K417N; N440K; G446S; S477N; T478K; E484A; Q493K; G496S; Q498R; N501Y; Y505H; T547K) of the receptor-binding domain (RBD) of SARS-CoV-2 for serological assays. The Protein was expressed in Expi293 cells and purified via Strep-Tactin XT and provided in Elution Buffer ( 100mM Tris-HCl; pH 8.0, 150mM NaCl, 1mM EDTA, 50mM Biotin).