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

  title={Frame‐shifts of digit identity in bird evolution and Cyclopamine‐treated wings},
  author={A. Vargas and G. Wagner},
  journal={Evolution & Development},
  • A. Vargas, G. Wagner
  • Published 2009
  • Biology, Medicine
  • Evolution & Development
  • 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… CONTINUE READING
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