Figure 3. Sirt6.KO mice display cardiac aging phenotype. (A) Quantification of NAD+ contents in the heart lysate of wild type and Sirt6.KO mice. Values are mean ± SE, n = 5. (B) Relative Mitochondrial citrate synthase activity in the heart of Wild type and Sirt6.KO mice. Values are mean ± SE, n = 5. (C) Relative mitochondrial DNA lesions in the heart of Wild type and Sirt6.KO mice. Values are mean ± SE, n = 5. (D) 8-Oxo-dG content in the DNA of the whole heart of Wild type and Sirt6.KO mice. Values are mean ± SE, n = 5. (E) Relative telomere length of Wild type and Sirt6.KO mice. Values are mean ± SE, n = 5. (F) Heart lysates of Wild type and Sirt6.KO mice were subjected to immunoblotting using indicated antibodies. Representative blots of three different mice in each group are shown, n = 6. (Quantification of blots is given in