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  2. T cell - Wikipedia

    en.wikipedia.org/wiki/T_cell

    T cells are one of the important types of white blood cells of the immune system and play a central role in the adaptive immune response. T cells can be distinguished from other lymphocytes by the presence of a T-cell receptor (TCR) on their cell surface. T cells are born from hematopoietic stem cells, [1] found in the bone marrow.

  3. Lymphocyte - Wikipedia

    en.wikipedia.org/wiki/Lymphocyte

    A lymphocyte is a type of white blood cell (leukocyte) in the immune system of most vertebrates. [1] Lymphocytes include T cells (for cell-mediated and cytotoxic adaptive immunity), B cells (for humoral, antibody-driven adaptive immunity), [2] [3] and innate lymphoid cells (ILCs; "innate T cell-like" cells involved in mucosal immunity and homeostasis), of which natural killer cells are an ...

  4. T helper cell - Wikipedia

    en.wikipedia.org/wiki/T_helper_cell

    The T helper cells (T h cells), also known as CD4 + cells or CD4-positive cells, are a type of T cell that play an important role in the adaptive immune system. They aid the activity of other immune cells by releasing cytokines .

  5. Thymus - Wikipedia

    en.wikipedia.org/wiki/Thymus

    Once mature, T cells emigrate from the thymus to provide vital functions in the immune system. [11] [12] Each T cell has a distinct T cell receptor, suited to a specific substance, called an antigen. [12] Most T cell receptors bind to the major histocompatibility complex on cells of the body.

  6. Adaptive immune system - Wikipedia

    en.wikipedia.org/wiki/Adaptive_immune_system

    The activation of a naive helper T-cell causes it to release cytokines, which influences the activity of many cell types, including the APC (Antigen-Presenting Cell) that activated it. Helper T-cells require a much milder activation stimulus than cytotoxic T cells. Helper T cells can provide extra signals that "help" activate cytotoxic cells. [6]

  7. Immune system - Wikipedia

    en.wikipedia.org/wiki/Immune_system

    Gamma delta T cells (γδ T cells) possess an alternative T-cell receptor (TCR) as opposed to CD4+ and CD8+ (αβ) T cells and share the characteristics of helper T cells, cytotoxic T cells and NK cells. The conditions that produce responses from γδ T cells are not fully understood.

  8. List of immune cells - Wikipedia

    en.wikipedia.org/wiki/List_of_immune_cells

    Memory T cell: Lymphocyte: T cell: MTC; 8-10 Memorizes the characteristics of the antigens; Triggers an accelerated and robust secondary immune response [4] [18] T helper cell: Lymphocyte: T cell: T h cells; CD4 + cells; CD4-positive cells; 8-10 Aids the activity of other immune cells by releasing cytokines [4] [19] Natural killer T cell ...

  9. Regulatory T cell - Wikipedia

    en.wikipedia.org/wiki/Regulatory_T_cell

    The regulatory T cells (Tregs / ˈ t iː r ɛ ɡ / or T reg cells), formerly known as suppressor T cells, are a subpopulation of T cells that modulate the immune system, maintain tolerance to self-antigens, and prevent autoimmune disease. T reg cells are immunosuppressive and generally suppress or downregulate induction and proliferation of ...