Greater Growth of Proximal Metatarsals in Bird Embryos and the Evolution of Hallux Position in the Grasping Foot
@article{Botelho2017GreaterGO, title={Greater Growth of Proximal Metatarsals in Bird Embryos and the Evolution of Hallux Position in the Grasping Foot}, author={J. Botelho and Daniel Smith-Paredes and S. Soto-Acu{\~n}a and Daniel N{\'u}{\~n}ez-Le{\'o}n and V. Palma and A. Vargas}, journal={Journal of Experimental Zoology Part B: Molecular and Developmental Evolution}, year={2017}, volume={328}, pages={106–118} }
In early theropod dinosaurs-the ancestors of birds-the hallux (digit 1) had an elevated position within the foot and had lost the proximal portion of its metatarsal. [...] Key Result To assess how the adult phenotype is acquired, we produced fate maps of the metatarsals of day 6 chicken embryos injecting the lipophilic tracer DiI. The fates of these marks indicate a larger expansion of the metatarsals at their proximal end, which creates the illusory effect that d1 moves distally.Expand Abstract
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