Anti-His antibody Immobilized on CM5 Chip captured Spike RBD His Tag, SARS-CoV-2 (BA.4/Omicron) (Cat. No. UA030024), can bind ACE2 Fc Chimera, Human (Cat. No. UA020026) with an affinity constant of 0.162 μM as determined in SPR assay (Biacore T200).<