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From the following article:

Evolutionary origin and development of snake fangs

Freek J. Vonk, Jeroen F. Admiraal, Kate Jackson, Ram Reshef, Merijn A. G. de Bakker, Kim Vanderschoot, Iris van den Berge, Marit van Atten, Erik Burgerhout, Andrew Beck, Peter J. Mirtschin, Elazar Kochva, Frans Witte, Bryan G. Fry, Anthony E. Woods & Michael K. Richardson

Nature 454, 630-633(31 July 2008)

doi:10.1038/nature07178

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Figure 1 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

Figure 1

Adult maxillary dentition mapped onto a molecular snake phylogeny to show relative positions of the various fang types.

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Figure 2 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

Figure 2

Shh expression in the embryonic snake palate, showing the posterior developmental origins of front fangs.

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Figure 3

Sections of the shh in situ hybridizations of the embryonic upper jaw in five snake species, showing the posterior and anterior dental laminae.

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Figure 4

Schematic three-dimensional reconstructions showing the similarity in morphogenesis between the rear and front fangs.

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