Qi Z, He J, Su Y, He Q, Liu J, Yu L, Al-Attas O, Hussain T, Ding S, Ji L and Qian M. Physical Exercise Regulates p53 Activity Targeting SCO2 and Increases Mitochondrial COX Biogenesis in Cardiac Muscle with Age. PLoS One. 2011; 6(7): e21140. Epub 2011 Jul 7.