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MicroRNAs (miRNAs) are small noncoding RNAs that regulate gene expression at the post-transcriptional level by either degradation or translational repression of a target mRNA. More than 400 miRNAs have been identified in the human genome, but the relevance of most of them to physiological and pathological processes remains unclear. Although downregulation of the miRNA-processing enzymes Dicer and...