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: '''White blood cells''' make up less than 1% of the [[blood]].
: '''White blood cells''' are produced in the [[Bone Marrow|bone marrow]].
: '''White blood cells''' can weaken and kill [[pathogen]]s including [[virus]]es, [[Pathogenic Fungus|fungi]], [[Pathogenic Bacteria|bacteria]] and [[protozoaPathogenic Protist|protists]].
There are two main types of '''white blood cell''' that you should know:
*[[Phagocyte]]s - Which engulf and then break down [[pathogen]]s.