There was a significant increase in the percentage of monocyte/macrophages and regulatory (CD4+CD25+) T cells in TGFβ1 TG mice with lung fibrosis compared to WT and TGFβ1 TG mice without lung fibrosis (Supplementary Fig. 2a, b; Supplementary Table 1). The gene discussed is CD4; the disease is pulmonary fibrosis.