SOD1 and hereditary elliptocytosis: Pearson correlation coefficient analysis for all HE patients showed significant direct correlations between the two antioxidant enzymes as follows: SOD vs. ammonia levels (n = 40, r = 0.452, p = 0.005) (Figure 1A), and GPx vs ammonia levels (n = 40, r = 0.460, p = 0.007) (Figure 1B).