To complement and extend the immunohistochemical studies in lung fibrosis, following bleomycin treatment of tamoxifen-induced Pdgfrb-CreERT2, ROSA26R(Zs/+) mice, lung Zs+ cells were isolated by fluorescence-activated cell sorting (FACS) and subjected to qRT-PCR. Here, PDGFRB is linked to pulmonary fibrosis.