Helmut Kettenmann is at the Max Delbrück Center for Molecular Medicine, Robert-Rössle-Strasse 10, 13082 Berlin, Germany. kettenmann@mdc-berlin.de
Microglia, the brain's intrinsic immune cells, rapidly sense brain injury and help clear cellular debris. Haynes et al. now show that P2Y12 receptors are critical for activating microglia and directing them to the site of injury.
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