To this end, Pdgfrb-CreERT2, ROSA26R(mTmG/+) mice were injected with tamoxifen and rested to mark PDGFR-β+ cells (Supplementary Fig. 5a, b) and then treated with a single orotracheal dose of phosphate-buffered saline (PBS) or bleomycin to induce lung fibrosis (Fig. 1a and Supplementary Fig. 5c, d). The gene discussed is PDGFRB; the disease is pulmonary fibrosis.