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T Cells
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== Major Subtypes: Killers & Helpers == Your body creates several different types of T cells to keep you safe. Each of these types has a different role to play in your immune system. Two of the major subtypes are “killer” (cytotoxic) T cells and “helper” (CD4+ cells) T cells. === Killer T Cells === Killer T cells<sup>[https://web.archive.org/web/20230719072102/https://askabiologist.asu.edu/t-cell]</sup> are nicknamed killers because they can actually kill virus-infected cells. They can also kill cancer cells—meaning they are super, super valuable. They have small signaling proteins called cytokines that they use to call for help from other cells when your body is mounting an immune response. === Helper T Cells === Unlike the killer T cells, the helper T cells work by activating other cells in your body. By activating your body’s memory B cells and your body’s killer T cells, they set off an even bigger immune response within your body.
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