FOXP3 and influenza: Despite the 4-fold difference in adoptively transferred Uhrf1fl/fl iTregs, quantification of adoptively transferred iTregs in the lungs and spleens of influenza-infected mice at 24 DPI revealed a significantly lower frequency and total number of Uhrf1fl/fl iTregs and, unlike at 11 DPI, a concomitantly larger Foxp3-GFP–tdTomato+ ex-FOXP3 population in recipients of Uhrf1fl/fl iTregs (Supplemental Figure 6, D–I).