To determine SOD2 protein expression levels in the endothelium of patients with SCD, lung tissue samples from 4 patients (age 44.2 ± 9.9 years, 2 female) and 4 race matched controls (43 ± 13.7 years, 2 female) were stained with SOD2 (Figure 1A). The gene discussed is SOD2; the disease is Schnyder corneal dystrophy.