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_T. rex_ jaw

I'm attempting a sculpture of the skull of _T. rex_ and am hoping folks on
the list can help with a couple questions: 1) Is it proper to sculpt the
distal ends of the dentaries on (an adult) _T. rex_ as unfused? And what
about the joints between the dentary and surangular/angular bones--were they
fused? What I've read about _T. rex_ seems to suggest that the lower jaw
allowed some movement in these joints (indicating an unfused condition), but
it's never really been clear.  What's the latest thinking on that?