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The body's immune system is a surveillance system that helps the body recognize "self" from "notself," attacking and destroying whatever it perceives to be notself, whether that happens to be an invading virus or one of the body's own cells that has begun dividing uncontrollably as a cancer. The body's immune system has several lines of defense, including T-lymphocytes (or T-cells) and B-lymphocytes (B-cells), which protect against a number of viral, bacterial, and parasitic infections. An additional line of defense is provided by cells called natural killer (NK) cells, which are capable of killing a wide variety of targets, including tumor cells.
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