The author is in the Department of Biochemistry and Cell Biology, Rice University, 6100 Main Street, Houston, Texas 77005, USA. bartel@rice.edu
MicroRNAs have established roles in negatively regulating messenger RNAs. Two plant microRNAs have recently been shown to target certain non-protein-coding RNAs for cleavage, adding a new dimension to the known roles of these tiny riboregulators.
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