Recent work reveals that adenosine-to-inosine editing occurs in a number of cellular microRNAs (miRNAs). Such editing is shown to diminish the expression of one miRNA and alter the target specificity of another. This changes our current views significantly by not only increasing the repertoire of miRNAs and their potential targets, but also providing mechanisms for how to regulate them and direct them to alternative targets.
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Das et al. (2007) studied this question.