Tiny, Previously Undiscovered Capillaries May Exist Inside People's Bones

These tiny tunnels — spotted in lab mice and traces of it in one inquisitive researcher — may be vital for transporting immune cells out of bones, where they are made. In the study, researchers found hundreds of previously unknown capillaries — the tiniest blood vessels in the body — in the leg bones of mice. The discovery of something in mice, however, doesn't necessarily mean it exists in humans, and there can often be a long period between an animal discovery and confirmation of the fin...

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