Earliest evidence of limb bone marrow in the fin of a 370 million year old fish

The earliest fossil evidence for the presence of bone marrow in the fin of a 370 million-year-old fish. Long bones, which are found in the limb of tetrapods, are not only important for locomotion and supporting the weight of the body, but also host the bone marrow. The latter plays a major role in haematopoiesis, i.e. the formation of blood cells.

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