Figure 4c demonstrates that there was no significant difference in normal or IPF fibroblasts that were transfected with siRNA-PG or with a control siRNA, Φ-siRNA and seeded on a fibronectin-coated dish (Normal Φ-siRNA and siRNA-PG, n = 17 and IPF Φ-siRNA and siRNA-PG, n = 14). Here, FN1 is linked to idiopathic pulmonary fibrosis.