Fig. 7

Competitive curve of cell capturing inhibition by serum purified from Spike-protein-immunized mice. Serum from S-protein immunized non-immunized mice were titrated and pre-incubated in SARS-CoV-2 Spike S1 coated wells for 1 h before the addition of ACE2-HEK293 cells. Data were plotted with a four-parameter logistic (4PL) regression curve fit of the relative amount of captured cells determined by CCK8 test (y-axis) versus 1:2n diluted serum samples (x-axis)