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OBSOLETE. The chemical reactions and pathways involving microRNA, a large family of 21-22 nucleotide non-coding RNAs with presumed post-transcriptional regulatory activity. [GOC:sm]
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The chemical reactions and pathways involving miRNA, microRNA, a class of single-stranded RNA molecules of about 21-23 nucleotides in length, which regulates gene expression. [PMID:17993620]
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