Discovery reveals aging human brains receive immune cell reinforcements from blood
The brain's immune system has long been thought to exist independently from the rest of the body, complete with its own specialized immune cells and a blood-brain barrier that limits what can travel into the brain.
For years, it was believed the brain possessed its own immune system separate from the rest of the body. However, Stanford researchers have now discovered that as humans age, their brains experience a significant influx of immune cells from the bloodstream. This finding, published in the journal Nature, challenges long-held perceptions and could pave the way for new treatments for neurological diseases.
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