Figure 2. mtDNA variants in patients with KC and controls. A: Venn diagram showing the number of identified variants in patients with keratoconus (KC) and controls. B: Number of identified variants in protein-coding genes identified in the study population. C: Number of synonymous and nonsynonymous variants identified in the study population. D: Number of synonymous and nonsynonymous variants in protein-coding genes identified in the study population. E: Number of synonymous and nonsynonymous variants in patients with KC and controls. F: Number of nonsynonymous variants in protein-coding genes identified in patients with KC and controls.