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Line 1: − '''White blood cells''' are a component of [[blood]]. As part of the body's [[immune system]], their function is to protect the body from disease and infection. White blood cells come in several varieties, each with a different role to play in neutralising harmful foreign substances. White blood cells, like all [[blood cells]], are produced in the [[bone]] marrow.+ − − They are also known as leukocytes. − − ==See Also== − *[[Red blood cell]] − *[[Platelets]] − − [[Category:Anatomy]]
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