Half of all dementias start with damaged 'gatekeeper cells': Once the cells are compromised, the brain's protective fort becomes leaky and allows blood toxins to trespass into the brain, damaging critical connections between brain areas, USC researchers say.

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Half of all dementias start with damaged 'gatekeeper cells': Once the cells are compromised, the brain's protective fort becomes leaky and allows blood toxins to trespass into the brain, damaging critical connections between brain areas, USC researchers say.