①Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV-2-S at 2 μg/ml can bind human ACE2 , the EC50 of SARS-CoV-2-S protein is 56.64 - 103.6 ng/ml.
②Measured by its binding ability in a functional ELISA. Immobilized SARS-CoV-2-S at 2 μg/ml can bind SARS-CoV-2-S Antibody , the EC50 of SARS-CoV-2-S protein is 36.79-48.87 ng/ml.