A, MRC5 cells, normal lung fibroblasts, and normal skin fibroblasts were incubated with or without M10, scrambled peptide (Scr), and TGFβ for 48h in serum-free medium. Cell extracts were immunoblotted with anti-collagen type I and anti-β-actin antibodies. B, Densitometric analysis of collagen type I immunoblots from three independent experiments. Values are the mean and SD from three independent experiments; *statistically significant differences between cells stimulated with M10 and TGFβ versus TGFβ (P<0.01).