TGFB1 and autoimmune uveitis: The application of TGF-β1-related biologic agents in autoimmune uveitis remains to have a long way to go due to the main role of TGF-β1 in pathogenic or nonpathogenic Th17 or Treg cell differentiation being relevant to the complex immune environment in various types of autoimmune uveitis and has not been clearly elucidated in previous studies.