A Backdoor Lets the Immune System Monitor the Brain

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In the 1920s, the scientific community unanimously concluded that the brain was disconnected from the immune system. However, this notion of “immune privilege” is being debunked after researchers found a backdoor in the brain that allows immune cells to monitor the brain from a distance and strike when necessary. This discovery suggests that diseases such as Alzheimer’s may be caused not by brain problems, but by a communication malfunction between the brain and the immune system.
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