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Definitions of microRNA:
noun: (genetics) A single-stranded, non-coding form of RNA, having only about 20-30 nucleotides, that has a number of functions including the regulation of gene expression
noun: Alternative form of microRNA [(genetics) A single-stranded, non-coding form of RNA, having only about 20-30 nucleotides, that has a number of functions including the regulation of gene expression]