Circadian activity in the brain regulates the movement of blood stem cells into and out of the bone marrow. Perhaps this process is testing the suitability of these cell 'tenants' for their new home — the remodelling bone.
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Scadden, D. Stem cells traffic in time. Nature 452, 416–417 (2008). https://doi.org/10.1038/452416a
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DOI: https://doi.org/10.1038/452416a
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