Natural killer lymphocytes are an example of:

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(C) Natural killer $(NK)$ cells are a type of white blood cell that plays a major role in the host-rejection of both tumors and virally infected cells

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cellular barrier

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(C) Natural killer $(NK)$ cells are a type of white blood cell that plays a major role in the host-rejection of both tumors and virally infected cells.In the context of innate immunity,the human body has four types of barriers:$1$. Physical barriers: e.g.,skin,mucus coating of the epithelium.$2$. Physiological barriers: e.g.,acid in the stomach,saliva in the mouth,tears from eyes.$3$. Cellular barriers: e.g.,polymorphonuclear leukocytes ($PMNL$-neutrophils),monocytes,macrophages,and natural killer lymphocytes.$4$. Cytokine barriers: e.g.,interferons.Therefore,natural killer lymphocytes are classified under cellular barriers.

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