Brain microglia increase their numbers in response to threats. Some of these cells were thought to enter the CNS from the blood, but two new studies suggest that experimental confounds could in part account for such results.
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Ransohoff, R. Microgliosis: the questions shape the answers. Nat Neurosci 10, 1507–1509 (2007). https://doi.org/10.1038/nn1207-1507
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DOI: https://doi.org/10.1038/nn1207-1507
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