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In Alxasaurus the semilunate carpal is
represented by two unfused elements. However, in birds the semilunate carpal
is a single bone throughout the development. How can this
be?
The bones simply "fuse" before they even
ossify. This happens in the sterna of e. g. humans and birds (the latter
consists of 2 elements, the former of at least 3).
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