LGALS9 and rheumatoid arthritis: This ability of Gal-9 to promote apoptosis specifically in pathogenic Th1 and Th17 cells and promote resolution through Treg expansion, highlights its potential therapeutic exploitation in various autoimmune pathologies such as rheumatoid arthritis and systemic lupus erythematosus (SLE) which are known to be driven by T cells [58, 60, 61].