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Abstract MicroRNAs (miRNAs) are phylogenetically widespread, small noncoding RNAs of 18–25 nucleotides in length, and are expressed in animals and plants. These small RNAs can regulate gene expression at the translational level through interactions with their target messenger RNAs, and have a role in the development of Caenorhabditis elegans , plants, and mammals. Although more than 200 miRNAs have been found in mammals, it is not easy to identify their targets. We investigated the target genes of miRNAs and analyzed the function of these miRNAs during retinoic acid (RA)-induced neuronal differentiation.
Kawasaki et al. (2005) studied this question.