GAD2 and autoimmune disease: GAD65 antibodies were not predictive of autoimmune disease in persons with DS/MMS (p = 0.119, 95%CI: 0.03–1.10), MMD (p = 0.99, 95%CI: 0.02–4.92) although were predictive of autoimmune disease in persons with DS (p < 0.001, 95%CI: 2.90–167).