Rogue immune cells can infiltrate old brains

Killer T cells may dampen new nerve cell production in aged mice

T cells

UNWELCOME GUESTS  In a brain region called the subventricular zone, stem cells (purple) create new nerve cells in mice’s brains. T cells (white), which are more common in older brains (right) than young brains (left), may interfere with this process.

Paloma Navarro

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