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Secreted exosomal miRNAs mediate inter-organ/tissue communication by downregulating gene expression, thereby modulating developmental and physiological functions. However, the source, route, and function have not been formally established for specific miRNAs. Here, we show that glial miR-274 non-cell autonomously modulates the growth of synaptic boutons and tracheal branches. Whereas precursor miR-274 was expressed in glia, mature miR-274 was secreted. miR-274 secretion to circulating hemolymphdoi:10.1101/547554 fatcat:2rgzakatkngvzjbitl4topgluu