SOD1 and endometritis: Moreover, in comparison to the healthy uterus, the expression of peroxidase glutathione peroxidase (GPX) (p < 0.01) and catalase (CAT) (p < 0.01) in the uterus with endometritis was markedly reduced, and the expression of superoxide dismutase (SOD) was also lower (p < 0.001) (Figure 2E–G).