Figure S1.

Flow cytometry assay for VOC RBDs binding to hACE2-expressing BHK-21 cells, related to Figure 1

The BHK-21 transfected with hACE2 fused with eGFP were incubated with the indicated His-tagged RBDs and stained with the anti-His-APC antibody. Non-transfected, non-stained control: the cells were neither transfected with hACE2 nor stained with the RBDs and the anti-His-APC antibody. Transfected, non-stained control: the cells were transfected with hACE2 but not stained with the RBDs and the anti-His-APC antibody.