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        9-12

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        Part of Crash Course
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        Contains Adult Language

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        Your Immune System: Natural Born Killer | Crash Course Biology #32

        Hank tells us about the team of defenses that make up our immune system. These defenses -- both innate and acquired -- are tasked with protecting our bodies from all the pathogens and bad guys. Luckily, our immune system is so well-honed that we're able to keep all these nasty pathogens at bay.

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