Frame‐shifts of digit identity in bird evolution and Cyclopamine‐treated wings

@article{Vargas2009FrameshiftsOD,
  title={Frame‐shifts of digit identity in bird evolution and Cyclopamine‐treated wings},
  author={Alexander O Vargas and G. Wagner},
  journal={Evolution & Development},
  year={2009},
  volume={11}
}
SUMMARY A highly conserved spatio‐temporal pattern of cartilage formation reveals that the digits of the bird wing develop from positions that become digits 2, 3, and 4 in other amniotes. However, the morphology of the digits of early birds like Archaeopteryx corresponds to that of digits 1, 2, and 3 of other archosaurs. A hypothesis is that a homeotic “frame‐shift” occurred, such that in the bird wing, digits 1, 2, and 3 develop from the embryological positions of digits 2, 3, and 4… Expand
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