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Nature 431, 350-355 (16 September 2004) | doi:10.1038/nature02871; Published online 15 September 2004

review article The functions of animal microRNAs

Victor Ambros1

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MicroRNAs (miRNAs) are small RNAs that regulate the expression of complementary messenger RNAs. Hundreds of miRNA genes have been found in diverse animals, and many of these are phylogenetically conserved. With miRNA roles identified in developmental timing, cell death, cell proliferation, haematopoiesis and patterning of the nervous system, evidence is mounting that animal miRNAs are more numerous, and their regulatory impact more pervasive, than was previously suspected.

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