Additional file 1.

The criteria of our mapping procedure. In order to exclude random match, the difference in start position between mature miRNA and mapped reads must be equal to or less than two. While, the difference in end position between mature miRNA and mapped reads must be equal to or less than five.

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Li et al. BMC Genomics 2012 13(Suppl 1):S13   doi:10.1186/1471-2164-13-S1-S13