Mutagenesis of human neuropeptide Y/peptide YY receptor Y2 reveals additional differences to Y1 in interactions with highly conserved ligand positions. - Akerberg H; Fällmar H; Sjödin P; Boukharta L; Gutiérrez-de-Terán H; Lundell I; Mohell N; Larhammar D (Regulatory peptides, 2010)