Comparison of miRNA expression in hippocampus between CCA and CCE rats. (A) Hierarchial-clustering map. Rows, individual miRNA; columns, individual sample. A1-3, B1-3, C1-3 and D1-3 are the sample numbers for each group. Values are normalized median. n = 3 samples/12 rats per group. (B) Comparison of the miRNA expression patterns between CCA and CCE rats. Altered hippocampal miRNAs in this study are divided into 5 classes according to their expression patterns in CCA and CCE rats. The percentage of each class was shown in the pie-chart.