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T cell

T cells are a subset of lymphocytes that play a large role in the immune response.

The abbreviation "T" stands for thymus, the organ in which their final stage of development occurs.

Every effective immune response involves T cell activation; however, T cells are especially important in cell-mediated immunity, which is the defense against tumor cells and pathogenic organisms inside body cells.

Note:   The above text is excerpted from the Wikipedia article "T cell", which has been released under the GNU Free Documentation License.
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October 6, 2015

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updated 12:56 pm ET