Critical role of arcuate Y4 receptors and the melanocortin system in pancreatic polypeptide-induced reduction in food intake in mice. oleh Shu Lin, Yan-Chuan Shi, Ernie Yulyaningsih, Aygul Aljanova, Lei Zhang, Laurence Macia, Amy D Nguyen, En-Ju Deborah Lin, Matthew J During, Herbert Herzog, Amanda Sainsbury