How some brain cells hook up surprises researchers: The untold secret life of the humble microglia

Immune cells known as microglia, long thought to be activated in the brain only when fighting infection or injury, are constantly active and likely play a central role in one of the most basic, central phenomena in the brain -- the creation and elimination of synapses. The finding catapults the humble microglia cell from its well-recognized duty of protecting the brain to direct involvement in creating the cellular networks at the core of brain behavior.

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