Underground Signaling Networks

  title={Underground Signaling Networks},
  author={Philip N. Benfey},
  journal={Mechanisms of Development},
The dorsal part of the turtle shell, or the carapace, is made of modified ribs and the vertebral column. The structure is regarded as an example of evolutionary novelties because the topographical relationships between the ribs and the scapula is reversed as compared to that in other amniotes. To explain this, the folding theory assumes that the turtle-specific body plan was achieved through sequential developmental changes that proceeded in a stepwise manner. This involved the axial arrest of… CONTINUE READING