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new ref: T.rex "blood cells"
Hot off the presses,
Schweitzer MH and JR Horner. 1999. Intravascular microstructures in trabecular bone tissues of Tyrannosaurus rex. Ann. Paleontol. 85: 179-192.
"Several characteristics link these microstructures to endogenous biological components, although their origin is not confirmed, and several hypotheses are considered."
A long awaited paper. Dispels earlier suggestions by others that these structures are diagenetic byproducts and hence nonbiological in origin. Nice work.
--John R. Hutchinson