Figure 4. Western-blot analysis of the identified proteins showing a significant decrease in protein expression of zinc-α2-glycoprotein (ZAG), lactoferrin, and IGKC (immunoglobulin kappa chain) in KC patients compared to control subjects. O.D.: optical density; A.U.: arbitrary units; GAPDH: glyceraldehyde-3-phosphate dehydrogenase; *p<0.05 versus control subjects.