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Science

Research findings worth understanding properly, not just the headline result.

Immune cells flood into the aging brain

Your brain's immune cells were supposed to be sealed in for life. In humans, blood cells start joining them at middle age.

A Stanford team traced shared mutations between blood and postmortem brain tissue — the same logic an ancestry test uses — and found circulating immune cells taking up residence in the aging human brain as functional microglia. Mice don't do it. The non-human primates tested didn't either. This is not a story about a leaky barrier.

BriefLookout · 26 Aug 2026 · 4 min read

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