MicroRNAs (miRNAs) are RNAs of ~21-24 nucleotides with pivotal regulatory roles in various developmental and physiological pathways. They inhibit the translation of mRNAs and thus constitute a “tuning” system for controlling post-transcriptional expression. While the understanding of miRNAs function in bilaterians such as flies, nematodes and mammals is expanding rapidly, little is known about miR ...