Within the CTRL cohort, MOG-IgG was observed in two of 27 SLE patients (1:320 and 1:160) and one of 24 OND patients (1:640, pediatric patient with genetically confirmed citrullinemia, presenting with encephalopathy and multifocal neurological deficits [24]), whereas all 50 healthy controls were MOG-IgG negative. Here, MOG is linked to citrullinemia.