NF-κB (p = 0.9999; p = 0.9999), iNOS (p = 0.9999; p = 0.6667), Col 1 (p = 0.3660; p = 0.5167), and Col 5 (p = 0.8571; p = 0.5714) protein expression remained unchanged in HCFs or KC-HCFs through 0.1% riboflavin UV-A illumination (Figs. 1 and 2). The gene discussed is NOS2; the disease is keratoconus.