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===About White Blood Cells===
: '''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 [[protozoa]].