The brain's ability to generate new neurons declines with age. This reduction is mediated by increased levels of an inflammatory factor in the blood of ageing mice and is associated with deficits in learning and memory. See Letter p.90
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Ransohoff, R. Blood ties. Nature 477, 41–42 (2011). https://doi.org/10.1038/477041a
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DOI: https://doi.org/10.1038/477041a
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