Figure 1. Competition flow cytometry assay demonstrating Rabbit anti-RBD monoclonal antibody (clone: DM26) blockade of SARS-CoV-2 (COVID-19) S protein RBD (1 ug/ml, TP724025) binding to Expi 293 cell line transfected with human ACE2. IC50=1717ng/ml. The Y-axis represents the geometric mean fluorescence intensity (MFI) while the X-axis represents the concentration of IgG used.