A tumor has been found in a mammal forerunner fossil that is 255 million years old. This is the first such discovery of its kind.

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A histological thin section of the gorgonopsid lower jaw, taken near the top of the canine root. The dark area on the right is bone. The backward C-shaped structure on the left is the canine root. The cluster of small circles resemble miniature teeth, indicative of compound odontoma. Megan Whitney/Christian Sidor/University of Washington

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