However, the peptides, even at a concentration as high as 7500 nM, did not show significant inhibition on the infection of SARS-CoV-2 pseudovirus in 293T/ACE2 cells (Figure 3(F)), in agreement with our previous findings: the unconjugated peptides such as IPB01 and EK1 could potently block the S protein fusion capacity but not the pseudovirus infection. This evidence concerns the gene ACE2 and infection.