Definitions for natural killer cell
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Random House Webster's College Dictionary
nat′ural kill′er cell`(n.)
a small killer cell that destroys virus-infected cells or tumor cells without activation by an immune system cell or antibody.
Category: Bacteriology and Immunology, Microbiology, Immunology
Ref: Compare killer T cell.
Wiktionary
natural killer cell(Noun)
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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"natural killer cell." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/natural killer cell>.