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Myocytes withdraw from the cell cycle to differentiation during muscle development.Given the capacity of microRNAs(miRNAs)regulating gene expression and during development,we screened for miRNAs that were muscle development-associated.Spoly(T)plus analysis of 273 miRNAs revealed 14 miRNAs were strongly upregulated with age of postnatal muscle development in vivo,including miR-195 and-497.