While we consider the fact that all samples were taken from patients with a previous diagnosis of MOG-EM/MOGAD (based on unequivocally positive MOG-IgG test results from previous samples and typical clinicoradiological findings) a particular strength of this study, we count the retrospective nature of this report and the limited treatment data available among its potential limitations. The gene discussed is MOG; the disease is erythema multiforme.