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miRNAs are well conserved in eukaryotic organisms and are thought to be a vital and evolutionarily ancient component of genetic regulation.[9][10][11][12] While core components of the microRNA pathway are conserved between plants and animals, miRNA repertoires in the two kingdoms appear to have evolved independently with different modes of function.[13] Plant miRNAs usually have perfect or near-perfect pairing with their messenger RNA targets and induce gene repression through degradation of their target transcripts.[14][15] Plant miRNAs may bind their targets in both coding regions and untranslated regions.[15] In contrast, animal miRNAs typically exhibit only partial complementarity to their mRNA targets. A 'seed region' of about 6-8 nucleotides in length at the 5' end of an animal miRNA is thought to be an important determinant of target specificity.[6][16] Combinatorial regulation is a feature of miRNA regulation. A given miRNA may have multiple different mRNA targets, and a given target might similarly be targeted by multiple miRNAs.[17][18]

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miRNAs are well conserved in eukaryotic organisms and are thought to be a vital and evolutionarily ancient component of genetic regulation.  ...

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