Recombinant expressed and purified N-terminal Domain (NTD) 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). Additionally, the Protein contains a SpyTag for generation of multimeric scaffolds using a Spycatcher on Lumazine-Synthase-particles.