TNFSF18 (TNF Superfamily Member 18): Also known as GITR ligand, TNFSF18 is involved in modulating immune responses. It binds to GITR on T cells and regulatory T cells, enhancing the effector T cell response while inhibiting the function of regulatory T cells. This dual role makes TNFSF18 an important target in cancer immunotherapy and in the treatment of autoimmune diseases....