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Changes in carboxymethyl-lysine level (CML), a biomarker for aging. Data are results for skin collagen taken from five to seven young and old mice. The level of CML clearly increased with age for the wild-type and Sod2+/−Gpx1−/− mice but was not different between the two groups. Diamond-shaped symbols represent data from the wild-type mice; squares, the Sod2+/−Gpx1−/− mice.
