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Natural Killer (NK) cells are a crucial component of the innate immune system, providing a first line of defense against viral infections and tumor cells. Unlike T and B lymphocytes, NK cells do not require prior sensitization to recognize and destroy abnormal cells, making their response rapid and non-specific. They are large ____ ______ ___ __________ ______ ________ _________ __________ _______ __________ ________.
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