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Pick Your Battles

How Immune System Tells Bacterial Friend from Foe

By Anette Breindl
Science Editor

Monday, April 23, 2012
The immune system's raison d'être is to protect us from invading microbes. But in the intestines, at least, its chances of encountering bad bugs, which necessitate a vigorous response, are, if not exactly as rare as a lightning strike, then nevertheless the exception rather than the rule.

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