Takahashi, A. & Amemiya, Y. & Nozaki, M. & Sower, S.A. & Kawauchi, H. (2001)
Evolutionary significance of proopiomelanocortin in agnatha and chondrichthyes. Comparative Biochemistry and Physiology – Part B, Biochemistry and Molecular Biology, 129(2–3), 283–289
DOI: 10.1016/S1096-4959(01)00330-X
Forlano, P.M. & Maruska, K.P. & Sower, S.A. & King, J.A. & Tricas, T.C. (2000)
Differential distribution of gonadotropin-releasing hormone-immunoreactive neurons in the stingray brain: functional and evolutionary considerations. General and Comparative Endocrinology, 118(2), 226–248
DOI: 10.1006/gcen.2000.7467