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White blood cells are the body's primary defense against infections. There are 5 different types of white cells - neutrophils, eosinophils, basophils, lymphocytes and monocytes. These white cells are able to change and alter according to the needs and situations to fight against invasion by foreign bodies. For example, neutrophils function by engulfing, digesting and killing bacteria whereas lymphocytes function together in a complex immune process against viruses and other organisms. Hence, white cells play an important role in the body's immune response mechanism.
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