Considering the significantly higher percentage of CD45–CCR10+ and the critical role of fibroblasts in lung fibrosis (37, 42, 43), we further assessed CCR10 expression by cultured fibroblasts from lung explants and confirmed increased percentage of CCR10+ fibroblasts (Figure 1, K and L) and GMFI (Figure 1M) of CCR10 in IPF cultures compared with normal cultures. This evidence concerns the gene PTPRC and pulmonary fibrosis.