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Listen to native speakers pronounce “immune reaction” in real conversational contexts with synchronized timestamps and subtitles.
There's so much of it there that if, suddenly, the immune system goes berserk over a protein that's in super high abundance within the brain, not surprisingly,you set off a pretty bad immune reaction.And you can imagine that having a lot of inflammation, a lot of immune cells going berserk around stuff that they think is foreign around the brain, can cause problems.