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T cell facts for kids

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T cell activation
A diagram showing the activation of T cells.

A T cell is a type of lymphocyte, a white blood cell.

It plays an important role in the immune system by attacking virus-infected cells, foreign cells, and cancer cells. The "T" in T cell stands for thymus. The thymus is where T cells mature.


  • Regulatory T cells (Treg cells), used to be called suppressor T cells
  • γδ T cells
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T cell Facts for Kids. Kiddle Encyclopedia.