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. Author manuscript; available in PMC: 2020 Jan 29.
Published in final edited form as: Nat Ecol Evol. 2019 Jul 29;3(8):1241–1252. doi: 10.1038/s41559-019-0945-8

Figure 2. Type 2 vomeronasal receptors have expanded in Komodo dragons and several other squamate reptiles.

Figure 2.

(A) Type 2 vomeronasal gene counts in squamate reptiles. (B) Unrooted gene phylogeny of 1,024 vomeronasal Type 2 receptor transmembrane domains across squamate reptiles. The topology of the tree supports a gene expansion ancestral to squamates (i.e., clades containing representatives from all species) as well as multiple species-specific expansions through gene duplication events (i.e., clades containing multiple genes from one species). Branches with bootstrap support less than 60 are collapsed. Colors correspond to species in (A). Clades containing genes from a single species are collapsed.