Photo: Many Dino Fossils Could Have Soft Tissue Inside

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The skull of the famous Tyrannosaurus rex nicknamed Sue resides at the Field Museum in Chicago.

Using a fossilized thighbone from a different T. rex, scientists were able to extract dinosaur soft tissue for the first time last year. Since then, repeats of the experiment have revealed that soft-tissue dinosaur remains may not be that rare, prompting scientists to rethink a long-standing model of how the fossilization process works.

Photograph by Ira Block/NGS

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