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A Fossil Rarity: Tumor Found in 255 Million-year-old Beast

Scientists examining the jawbone of a saber-toothed, mammal-like beast that prowled Tanzania 255 million years ago have come across a remarkable fossil rarity: one of the oldest-known tumors. University of Washington researchers on Thursday described a benign tumor composed of miniature toothlike structures they found embedded next to the root of the creature's enlarged canine tooth while studying an unrelated aspect of the jaw. The animal was a member of an extinct group of...

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