Kawakoshi, A. & Kaiya, H. & Riley, L.G. & Hirano, T. & Grau, E.G. & Miyazato, M. & Hosoda, H. & Kangawa, K. (2007)
Identification of a ghrelin-like peptide in two species of shark, Sphyrna lewini and Carcharhinus melanopterus.
General and Comparative Endocrinology, 151(3), 259–268 DOI: 10.1016/j.ygcen.2006.10.012