Intraperitoneal injection of ghrelin induces Fos expression in the paraventricular nucleus of the hypothalamus in rats. - Ruter,J.; Kobelt,P.; Tebbe,J.J.; Avsar,Y.; Veh,R.; Wang,L.; Klapp,B.F.; Wiedenmann,B.; Tache,Y.; Monnikes,H. (Brain Res, 2003)