Fig. 2From: Vitamin B12 in Leber hereditary optic neuropathy mutation carriers: a prospective cohort studyDistribution of the extended B12 diagnostic laboratory values in the LHON cohort. a serum vitamin B12 (B12); b serum methylmalonic acid (MMA); c total plasma homocysteine (tHCy); and d serum holotranscobalamin (holoTC)Back to article page