Deletion of the glycosylase genes Myh or Ogg1 led to decreased infection by HIV and FIV (Figure 3A; Myh and HIV P = 0.004, Ogg1 and HIV P = 0.0011, Myh and FIV P = 0.013, Ogg1 and FIV P = 0.0001). This evidence concerns the gene OGG1 and infection.