Community structure of miRNAs found in module 2 of the representative partition of the original modular decomposition performed at gamma = 1. For the (A) KR, (B) FDR1 and (C) FDR5 datasets, the heatmap of the correlation matrix is shown on the left. Each row and column represents a single miRNA. Color bars indicate the submodule assignment in each dataset of every miRNA in the heatmap to the left. Submodule 1 is blue, 2 is yellow and 3 is red. Not all miRNAs in each dataset are present in the other two; miRNAs that are absent are white in the color bar. Whisker plots show the log10(expression) of the miRNAs in the submodule. The red rectangle highlights module 2A, dominated by Dlk1-Dio3 miRNAs; 15 of 21 in the KR dataset, 31 of 33 in the FDR1 dataset and 39 of 42 in the FDR5 dataset are from the Dlk1-Dio3 region. See also Figure S4 in Additional file 1.