Analysis of PPARα. A, Western blotting analysis of PPARα. 1, 2, 3, and 4 represent liver homogenates from SAMR1-1m, SAMP8-1m, SAMR1-6m, and SAMP8-6m, respectively. B, mRNA levels of PPARα. 1, 2, 3, and 4 represent mRNA from livers of SAMR1-1m, SAMP8-1m, SAMR1-6m, and SAMP8-6m, respectively.