FOXP3 and influenza: To further elucidate whether engraftment was influenced by the inflammatory microenvironment of the lung, we harvested adoptively transferred Foxp3-GFP+tdTomato+ cells from the spleens and lungs of Foxp3GFP-DTR recipients of Uhrf1+/+ or Uhrf1fl/fl iTregs that received DTx but not influenza.