Fig. 2. The relative expression of mRNA including Sirt1, Sirt3, PGC-1α, NRF1 and TFAM in skeletal muscle tissues of mice. The expressions of mRNA in WT mice are normalized to 1.0. Data are presented as mean ± SD (n = 6). *P < 0.05, **P < 0.01, ***P < 0.001 versus with ob/ob group.