Fossilized dinosaur blood (but no genetic material)

The fossilized blood cells were found in the claw of an a unidentified theropod (a dinosaur group which includes T. rex and velociraptor). The collagen was found in several other bones, including ribs from unknown species or genuses. Furthermore, molecular analysis of the fossilized tissues (using a tool called a mass spectrometer) has revealed the fossils contain some of their original biological proteins and amino acids—molecules that are thought to degrade completely after 4 million years.

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