Here we found that the increase in Tg+ lung fibrosis seen in the setting of CD25 depletion is accompanied by a 1.61-fold increase in the percentage of CD45+ cells that are Col Iα1+ fibrocytes (p = 0.04 Figures 3A–E) and a 1.56-fold increase in the absolute quantities of these cells (p = 0.0445, Figure 3F). This evidence concerns the gene TG and pulmonary fibrosis.