Protecting the brain from infection may start with a gut reaction
In mice, immune cells on the brain’s surface are first trained in the intestines to recognize invaders
![illustration of plasma cells](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2020/11/111020_AP_brain-infection_feat.jpg?fit=1028%2C579&ssl=1)
Antibody-producing plasma cells (illustrated) have now been found in the protective barrier that surrounds the brain.
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