"Hollow, transparent and flexible vessels [which] were slightly pigmented" and its "Osteocytes… had pigmented elongate cell bodies, some with internal contents and short, stubby filipodia."
Of the various dinosaur soft tissue types, the paper says:
"As arguably the most labile and easily degraded of the structures we observed, the presence of soft vessels is enigmatic. They are neither biomineralized nor have any obvious inherent characteristics that would favour preservation…"
National Geographic and the journal Science reported on yet another discovery confirming the survival of soft tissue from a dinosaur, including blood vessels, connective tissue, and blood cell protein amino acid chains partially sequenced at Harvard. This allegedly 80-million year-old non-fossilized duck-billed dinosaur tissue was discovered by a team led by researchers at North Carolina State University.
North Carolina State University discovered original biological tissue from a supposedly 65-million year old Tyrannosaurus Rex thighbone, with transparent and pliable blood vessels containing red blood cells!