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Does the human or bird sternum consist of multiple
elements in any phase of the development? I mean, you say that these elements
fuse prior to ossification, but are there multiple pieces of cartilage around in
the beginning, or does the whole cartilagenous structure appear in one piece
from the very beginning? I believe Hinchliffe has shown that the cartilage
giving rise to the semilunate carpal in birds is a unified whole throughout its
existence.
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