Stromal cells in OP fibroblastic plugs expressed higher degrees of MnSOD (Figure 4(c)) ECSOD (Figure 4(e)), and of i-NOS (Figure 5(a)) than fibroblasts of UIP FF (Figures 4(d), 4(f), and 5(b), resp). Here, SOD2 is linked to idiopathic pulmonary fibrosis.