Waugh, D. & Rusakov, Y. & Bjenning, C. & Conlon, J.M. & Bondareva, V. & Nielsen, P.F. (1995)
Tachykinins with unusual structural features from a urodele, the amphiuma, an elasmobranch, the hammerhead shark, and an agnathan, the river lamprey.
Peptides, 16(4), 615–621 DOI: 10.1016/0196-9781(95)00010-H