Natural-killer-cell meaning

A lymphocyte that is activated by double-stranded RNA or lymphokines and fights off viral infections and tumors without evident antigenic specificity.
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A large granular lymphocyte that kills virus-infected, cancerous, or abnormal cells without first having been exposed to specific antigens and that also produces a variety of cytokines.
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(immunology) Any cell that expresses cell surface receptors that deliver signals to either activate or inhibit a response as part of the immune system.
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