MicroRNAs (miRNAs) are a large class of noncoding regulatory RNAs. In animals miRNAs base-pair with the 3’ untranslated region (UTR) of their target mRNAs to target them for cleavage or translational repression. Repressed target mRNAs accumulate in cytoplasmic structures termed P-bodies, where some targets may be degraded. Other targets appear to be stable and can subsequently be re-expressed. In ...