--- "Stephen V. Cole" <adbinc@arn.net> wrote:
>Medullary bone, a >highly mineralized, bony reproductive tissue present >in the endosteal cavities of all extant egg-laying >birds thus far examined, has recently been reported in >Tyrannosaurus rex. ..... alligators .... shows no >differences on the endosteal surfaces of the long >bones, and no evidence of medullary bone
Do we know anything about the presence or absence of medullary bone in Sauropods, Pterodactyles, or the bird-hip dinosaurs (ducksbills, ceratopsians, etc.)?
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Unknown until someone breaks a couple of sauropod and ornithischian bones in hopes of finding original cellular material.
Jason
Sounds like a project for somebody, maybe PHD paper?