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Fossilized Red Blood Cells Discovered in 115-Million-Year-Old Dinosaur Bones

Researchers analyzing the hind leg bones of an Aratasaurus that lived 115 million years ago have identified the presence of fossilized red blood cells and heme. The discovery marks a significant finding, as scientists previously considered the preservation of such organic compounds in ancient fossils to be extremely unlikely.

Referenced News Coverage (2 sources)

Evidence of red blood cells found in 115-million-year-old dinosaur’s bones (The Independent UK)
Fossilised red blood cells found in 115m-year-old dinosaur’s bone, say scientists (The Guardian)