In a smaller study with 40 patients, several systemic autoantibodies (ANA, AMA, APCA, as well as antibodies against LKM, Tp, Tg, and ASO) were investigated and no significant differences for these autoimmune parameters in OCD-sera compared to the patient control group were identified compared with patients suffering from other mental disorders including patients with psychotic and mood disorders [59]. Here, CACNA1A is linked to mental disorder.