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'''T cells''' are a type of [[white blood cell]] that play a central role in the [[immune system]]. They are called T cells because they mature in the [[thymus]] after initially being produced in the [[bone marrow]]. T cells are involved in [[adaptive immunity]], a system of responses that provide the body with the ability to recognize and remember specific [[pathogens]] or foreign substances, to mount stronger attacks each time the pathogen is encountered.

==Types of T cells==
There are several types of T cells, each with a unique function:
* '''[[Helper T cells]]''' (Th cells) – These cells coordinate the immune response by communicating with other cells. They can stimulate [[B cells]] to produce [[antibodies]] and help activate cytotoxic T cells and macrophages.
* '''[[Cytotoxic T cells]]''' (Tc cells, CTLs) – These cells are capable of directly killing infected cells, cancer cells, and transplanted cells.
* '''[[Regulatory T cells]]''' (Treg cells) – These cells play a critical role in maintaining immune tolerance and preventing autoimmune diseases by suppressing the immune response.
* '''[[Memory T cells]]''' – After an infection, some T cells become memory cells that persist long-term and can quickly expand to large numbers of effector T cells upon re-exposure to their antigen, providing a faster response to pathogens previously encountered.

==Function==
T cells recognize [[antigens]] through a complex with the [[Major Histocompatibility Complex]] (MHC). Helper T cells are primarily involved in recognizing antigens presented by MHC class II molecules, which are found on the surface of professional antigen-presenting cells (APCs) like [[dendritic cells]], [[macrophages]], and B cells. Cytotoxic T cells recognize antigens presented by MHC class I molecules, which are found on all nucleated cells.

Upon activation, T cells proliferate and differentiate into effector cells that perform functions critical to the immune response. For example, activated cytotoxic T cells can directly kill cells infected with viruses or bacteria, and helper T cells can stimulate B cells to produce antibodies against a wide range of pathogens.

==Clinical Significance==
T cells are crucial in the defense against infectious diseases and in cancer immunotherapy. Their ability to target and destroy cancer cells is the basis for several types of cancer treatments, including [[CAR T-cell therapy]], where T cells are genetically engineered to better recognize and kill cancer cells.

T cell deficiencies can lead to severe immunodeficiencies, where the body is unable to effectively respond to infections. Conversely, when T cells become overactive or misdirected, they can cause autoimmune diseases, where the immune system attacks the body's own tissues.

==Research and Future Directions==
Research on T cells continues to be a highly active field, with studies focusing on understanding their biology, developing new immunotherapies, and improving the effectiveness of vaccines. Advances in our understanding of T cells have the potential to revolutionize the treatment of a wide range of diseases, from infectious diseases to cancer to autoimmune disorders.

[[Category:Immunology]]
[[Category:Cell biology]]

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Tcell - Revision history

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