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Nature 439, 584-588 (16 November 2005) | doi:10.1038/nature04328;

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Early evolution of the venom system in lizards and snakes

Among extant reptiles only two lineages are known to have evolved venom delivery systems, the advanced snakes and helodermatid lizards (Gila Monster and Beaded Lizard). Evolution of the venom system is thought to underlie the impressive radiation of the advanced snakes (2,500 of 3,000 snake species).

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