Indeed, we showed that the infection rate of SARS-CoV-2 decreases in both A549-ACE2 and HEK293T-ACE2 cells treated with RIB or MPA through quantification of cells expressing N protein by immunofluorescence staining assays (Figures 7A, B, S5A, B) or sgRNA level by RT-qPCR (Figures 7C, S5C). The gene discussed is ACE2; the disease is infection.