Remember dropping your milk teeth? After a lot of wiggling the tooth finally dropped out. But in your hand was only the enamel-covered crown: the entire root of the tooth had somehow disappeared. In a paper published in Nature, a team of researchers led by Per Ahlberg, Uppsala University/SciLifeLab, apply synchrotron x-ray tomography to a tiny jawbone of a 424 million year old fossil fish in order to illuminate the origin of this strange system of tooth replacement.
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