Expression patterns of the Drosophila neuropeptide CCHamide-2 and its receptor may suggest hormonal signaling from the gut to the brain.
Li S, Torre-Muruzabal T, Søgaard KC, Ren GR, Hauser F, Engelsen SM, Pødenphanth MD, Desjardins A, Grimmelikhuijzen CJ. PLoS One. 2013; 8(10):e76131. Epub 2013 Oct 2.