Additional file 2.

Figure S1. provides a phylogenetic tree, and the corresponding most parsimonious evolutionary scenario, produced on the data used in Figure 3 with the addition of eubacterial sequences, addressing the less parsimonious scenario of Drosha’s direct evolution from eubacterial RNase III enzymes [10].

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Maxwell et al. BMC Genomics 2012 13:714   doi:10.1186/1471-2164-13-714