To expand our validation set, we identified 6 additional primary fibroblast lines (3 IPF and 3 control, which were part of the initial microarray study) that matched the sub-cultivation criteria for the original array analysis and assessed steady state protein levels for PDCD8, CFL2 and FUT10 (this requires substantially fewer cells than is needed for polyribosome preparations) (Figure 4F). This evidence concerns the gene CFL2 and idiopathic pulmonary fibrosis.