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MicroRNAs (miRNAs) are endogenous single-stranded non-coding small RNAs with a length of about 21 nt, that negatively regulate development and stresses. Rice miRNAs are representative of the monocot miRNAs, and many of them are non-conserved in Arabidopsis and the other plant species. Previous studies have shown that a majority of plant miRNAs are expressed from independent transcription units, whereas...