FN1 and pulmonary fibrosis: Histological analysis of whole lungs from these mice revealed that the adoptive transfer of these cells at either day 5 or 14 resulted in a marked reduction in the extent of pulmonary fibrosis compared with untreated bleomycin-challenged lungs at day 21 (Figure 3(c), middle, right, and left panels) and a significant decrease in the expression of both procollagen 3 and fibronectin 1 transcripts in the fibrotic lungs (Figure 3(d)).