Like a police officer calling for backup while also keeping a strong hold on a suspected criminal, immune cells in the brain take a two-tier approach to fighting off a threat, new research from the University of Michigan Health System finds. For the first time, the scientists managed to capture that reaction in action, showing how certain immune cells locked onto a model of virus-infected brain cells, while also sending signals to neighboring uninfected cells to let them know about the immune attack. The findings may help research on how the brain fights off viruses and tumors...

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