A Backdoor Lets the Immune System Monitor the Brain

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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