Genotypes of (A) NPY gene (BB: 240 bp; Bb: 240 bp + 161 bp + 79 bp; bb: 161 bp and 79 bp), (B) DRD2 gene (CC: 248 bp; TC: 248 bp +196 bp + 52 bp; TT:196 bp + 52 bp) and (C) VIP gene (II: 306 bp; ID: 306 bp + 154 bp + 152 bp; DD: 154 bp + 152 bp), M = marker 100 bp, Ctrl = PCR product.