Ringholm, A. & Klovins, J. & Fredriksson, R. & Poliakova, N. & Larson, E.T. & Kukkonen, J.P. & Larhammar, D. & Schioth, H.B. (2003)
Presence of melanocortin (MC4) receptor in spiny dogfish suggests an ancient vertebrate origin of central melanocortin system.
European Journal of Biochemistry / FEBS, 270(2), 213–221 DOI: 10.1046/j.1432-1033.2003.03371.x