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Lobe-finned fish tetrapod

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Lobe-finned fish tetrapod

The figure shows the divided internal structure of a bone from the 380 million-year-old lobe-finned fish Eusthenopteron (left) contrasting with the open marrow cavity of the limb bone of the tetrapod Discosauriscus (right), where haematopoiesis could occur.
Sophie Sanchez
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Sophie Sanchez
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  • The figure shows the divided internal structure of a bone from a 380 million-year-old lobe-finned fish(left) contrasting with the open marrow cavity of the limb bone of a tetrapod (right), where haematopoiesis could occur. Credit: Sophie Sanchez

    New light shed on the early evolution of limb bone marrow

    When and how bone marrow first originated in the limbs of early four-legged animals is disputed in evolutionary biology. With the help of powerful X-ray technology, an international research team, led by Uppsala University, has now discovered that this evolutionary adaptation most likely took place after the first tetrapods stepped ashore. The study is published in the scientific journal eLife.