Figure 2. Identification of differentially expressed microRNAs (DE-miRNAs) between the POCD-associated exosomes and non-POCD-associated exosomes. (A) The volcano figure of DE-miRNAs with the criteria of |log2 FC| > 1.5, and P value < 0.05. (B) The bidirectional hierarchical cluster analysis of these DE-miRNAs.