The human D5 dopamine receptor (DRD5) maps on chromosome 4.

@article{Polymeropoulos1991TheHD,
  title={The human D5 dopamine receptor (DRD5) maps on chromosome 4.},
  author={M. H. Polymeropoulos and Huasheng Xiao and C. R. Merril},
  journal={Genomics},
  year={1991},
  volume={11 3},
  pages={777-8}
}