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Neighbor-joining trees of mir-125 hairpins and let-7 cluster-combination among species. A. Neighbor-joining tree of mir-125 hairpins within conserved let-7 clusters among species. B. Neighbor-joining tree of combination sequence of let-7 clusters among species. The miRNAs of B. floridae are highlighted in red. miRNAs of human, rat and fish are noted in dark blue, purple and green, respectively. Abbreviations are the same as Figure 2.
