Reptile toxins
Fry BG, Vidal N, Norman JA, Vonk FJ, Scheib H, Ramjan SF, Kuruppu S, Fung K, Hedges SB, Richardson MK, Hodgson WC, Ignjatovic V, Summerhayes R, Kochva E. (2006) Early evolution of the venom system in lizards and snakes. Nature 439(7076):584-8.