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Watch 10 Things to Know About Season 9 Episode 6 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

The human immune system is amazing, consisting of a variety of cells all working together to identify and destroy invading cells and protect our bodies from infection. Unfortunately, in some cases, the immune system is unable to distinguish one from the other and begins to attack healthy cells.