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The normalized number of precursor and mature miRNAs per 10 Mbs indexed by miRBase for (A) human and (B) mouse (www.miRBase.org; miRBase v19 accessed on 8/11/2012). Red-dotted horizontal lines denote the average mature miRNAs per 10Mbs across the genome. Gray-dotted horizontal lines denote the number of standard deviation (SD) from the global average value.
