408573.fig.006a
(a) SOD 
408573.fig.006b
(b) CAT
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(c) GPx
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(d) Nonspecific Px
Figure 6: Age-related differences in specific activities of antioxidant enzymes in rat liver. The white column represents young (6-week-old) rats, and the hatched column indicates old (21-month-old) rats. Values are expressed as mean ± SD (six animals per age group) (*data with , Student’s t-test). SOD = superoxide dismutase; CAT = catalase; GPx = glutathione peroxidase; nonspecific Px = nonspecific peroxidase.