The breakthrough of RNA interference (RNAi) and related small-RNA mediated gene silencing pathways in eukaryotic cells has significantly given a new understanding of the regulation of gene expression and function.Studies have uncovered the hidden layers of regulation of gene expression, in which many families of small RNAs which were previously unidentified mediate gene silencing.Although RNAi and related gene-silencing pathways regulate the expression of genes by initiating the production of small RNAs with sequences complementary to portions of the transcripts that they regulate.However in...