We learned about the scope of your body, your cells, and some of your most common enemies, bacteria. About your soldier and guard cells that guard your insides, the mechanisms they use to identify and kill invaders, and how they use inflammation to prepare the battlefields of your body. We learned how your cells recognize things and how they communicate with each other. We explored the complement system that saturates every fluid in your body. We learned about your surveillance cells that get help when necessary. We learned about your internal infrastructure and how your body has billions of
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