Abstract
MicroRNAs (miRNAs) are key regulators of gene expression. They participate in many biological and pathological processes, from organ development to malignant transformation. Their functions are widely conserved, involving post-transcriptional silencing of gene expression. Over 2500 mature miRNA sequences have been identified in humans; however, recent studies have showed that the number of annotated miRNAs represent only a fraction of the total pool of existing miRNAs, suggesting that there are still many potentially undiscovered biologically relevant miRNAs encoded by the human genome.
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