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Immune system
The immune system is made up of all the body’s defence mechanisms against both external agents (e.g., viruses, bacteria, splinters) and internal threats (e.g., transplanted organs).
Immune system
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The immune system is the human body's set of defense mechanisms against external agents (e.g. microorganisms such as viruses and bacteria or a foreign body) or a threat from inside the body itself (e.g. a transplanted organ). The immune system's cells, like white blood cells, are our line of defense against attackers.
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