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Venomousness as a homologous trait between snakes and Gila monsters

Description
Phylogeny of snakes, venomous helodermatid lizards, and their relatives. The most recent common ancestor of these venomous species is indicated. If venomousness is a homologous trait in snakes and Gila monsters, we should expect to see venom production in some of the other descendants of this common ancestor, such as the monitors and iguanas shown in the tree. Adapted from Fry et al. (2006).
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