Salaneck, E. & Ardell, D.H. & Larson, E.T. & Larhammar, D. (2003)
Three neuropeptide Y receptor genes in the spiny dogfish, Squalus acanthias, support en bloc duplications in early vertebrate evolution.
Molecular Biology and Evolution, 20(8), 1271–1280 DOI: 10.1093/molbev/msg133