Associations among the miRNAs and ECs in the human genome. (A) The five targets of miRNA-a are regulated by EC-β. (B) A schematic picture showing a significantly concurrent pair of miRNA-a and EC-β. (C) The frequency distribution of the number of concurrent ECs for each miRNA. (D) The association network of ECs and miRNAs. The blue nodes represent ECs, the red nodes represent miRNAs.