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==Key Stage 3==
===Meaning===
The [[Immune System]] is a set of defenses internal defences the body can use to fight [[infection]].
===About the Immune System===
==Key Stage 4==
===Meaning===
The [[Immune System]] is a set of defenses internal defences the body can use to fight [[Infection|infectious]] [[pathogen]]s. ===About the Immune System===: The main part of the '''immune system''' is the [[White Blood Cell|white blood cells]].