... repressing the indicated targets and presumably hundreds of other as yetunidentified targets. (B) miR-34a and the miR-34a-binding site in the 3¢ UTR of genes shown in (A).miRNAs and cell signaling ... fac-tor induced the expression of miR-221 and miR-222 in PC12 cells, and that this induction is dependent onsustained activation of the ERK1 ⁄ 2 pathway [20].Furthermore, the induction of miR-34a ... inducedby the action of conserved signaling pathways but, in turn, the induced miRNAs regulate these pathways byrepressing the expression of components of the signal-ing pathways and, in some cases,...