KRT3 and keratoconus: Immunohistochemical studies of all CUCC buttons, including 5 eyes from keratoconus patients, 1 eye with corneal ectasia due to previous LASIK surgery and 3 eyes with corneal scars and irregular astigmatism following RK, underwent immunohistochemical staining with mAb 4A4 against ΔNp63, CX 43, and Krt3 monoclonal antibody (Table 2).