Additional file 11.

Closely clustered miRNAs of the silkworm. For our analysis, groups of miRNA genes located within 2.5 kb of each other are defined as clusters. The close proximity of these miRNA genes in each cluster implies that they are likely to be transcribed as a single polycistronic transcript. Actually, more clusters can be identified when the space region is extended to a wider region than 2.5 kb.

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Liu et al. BMC Genomics 2010 11:148   doi:10.1186/1471-2164-11-148