MUC4 and infection: We performed similar experiments on the inhibition of Ha-CoV-2 infection by SHREKs, and found that in addition to PSGL-1, CD164, TIM-1, MUC1, and MUC4 also inhibited the infection of Ha-CoV-2 virus (Figure 6C); The MUC4 vector had the strongest inhibition among these SHREKs.