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Small RNA guidesmicroRNAs, small interfering RNAs, andrepeat-associated small interfering RNAs, 21 to 30 nucleotidesin lengthshape diverse cellular pathways, from chromosomearchitecture to stem cell maintenance. Fifteen years after thediscovery of RNA silencing, we are only just beginning to understandthe depth and complexity of how these RNAs regulate gene expressionand to consider their role in shaping the evolutionary historyof higher eukaryotes.
Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
* To whom correspondence should be addressed. E-mail: phillip.zamore{at}umassmed.edu
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