IL6 and bipolar disorder: The study did not find significant differences between bipolar disorder patients and healthy control subjects for IL-1, IL-2, IL-5, IL-6, IL-8, IL-10, IL-12, IL-1β, IL-1 receptor antagonist, IFN-γ, transforming growth factor-β1 (TGF-β1), and TNF receptor type 2 [265].