Mechanisms Involved in the Enhanced Susceptibility of Senescent Rats to the Hepatocarcinogenic Effect of Peroxisome Proliferators: Role of Peroxisome Proliferator-Activated Receptor alpha (PPAR), Cell Proliferation and Oxidative Stress - Jihan A. Youssef; Pierre Ammann; Burhan L. Ghanayem; Linda S. Birnbaum; Mostafa Z. Badr (The Scientific World Journal)