![](http://www.alamy.com/thumbs/6/31DDDF61-1964-48ED-B6F5-FF2038BC67A0/2JKFTCY.jpg)
Meningeal macrophages (shown in white, red, and blue) are always alert to potential threats to brain tissue.
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Photo credit: © NIH / IMAGE POINT FR / BSIP / Alamy / Afripics
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