Figure 2. Heat map and hierarchical clustering of the 50 most significantly differentially expressed lncRNAs (a) and mRNAs (b) between the I/R and control groups. The data are depicted as a data matrix, in which each row represents one lncRNA (mRNA) and each column represents one sample. The relative lncRNA (mRNA) expression follows the color scale at the top. Red represents high relative expression, and green represents low relative expression; −3.0, 0, and 3.0 are fold changes in the corresponding spectrum. The magnitude of deviation from the median is represented by the color saturation.