How to cite this article: Chitsaz N, Dehghani L, Safi A, Esmalian-Afyouni N, Shaygannejad V, Rezvani M, et al. Evaluation of glucose-6-phosphate dehydrogenase serum level in patients with multiple sclerosis and neuromyelitis optica. The gene discussed is G6PD; the disease is multiple sclerosis.