Fig. 2From: Associations between the phenotype and genotype of MnSOD and catalase in periodontal diseaseSalivary antioxidant biomarker levels at the baseline and after treatment completion. The histogram with the error bar displays the mean and standard error. a Manganese superoxide dismutase (MnSOD); b Catalase. * p < 0.05 and ** p < 0.01, according to a paired t-testBack to article page