π§ Your Aging Brain Is Secretly Recruiting Immune Cells From Your Blood
Stanford researchers just overturned a long-held assumption: as we age, immune cells from the bloodstream cross the blood-brain barrier and transform into microglia β the brain's own immune defenders. The study was published in Nature on July 30, 2026, and used genetic fingerprinting to trace these migrating cells in real human brain tissue. This discovery could open the door to engineering immune cells that travel to the brain to fight Alzheimer's and other neurological diseases. What brain condition do you think could benefit most from this kind of therapy?
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