Reuters report:
70-million-year-old Tyrannosaurus rex fossil dug out of a hunk of sandstone has yielded soft tissue, including blood vessels and perhaps even whole cells, U.S. researchers reported on Thursday. To make sure she was seeing what she thought she was seeing, Schweitzer, a biologist by training, compared the Tyrannosaur samples with bone taken from a dead ostrich. She chose an ostrich because birds are thought to be the closest living relatives of dinosaurs and ostriches are big birds. Both the dinosaur and ostrich blood vessels contained small, reddish brown dots that could be the nuclei of the endothelial cells that line blood vessels.
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