In addition, Th1 cells (14, 19, 21), Th 17 cells (18, 32), and their related cytokines (such as IL-6, IL-12, IL-17, IL-23, and IFN-γ) were found to be involved in the pathogenesis of human VKH disease. Here, IL6 is linked to Vogt-Koyanagi-Harada disease.