Binding of biotinylated SARS-Cov-2 Spike RBD protein to human ACE2 in the ACE2/VERO stable cell line. ACE2/VERO cells were probed with different amounts of biotinylated SARS-Cov-2 Spike RBD protein (Abeomics, Cat. No. 21-1005-B) and analyzed through In-Cell ELISA using HRP-Streptavidin for detection.