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  2. B cell - Wikipedia

    en.wikipedia.org/wiki/B_cell

    After B cells receive these signals, they are considered activated. [20] T-dependent B cell activation. Once activated, B cells participate in a two-step differentiation process that yields both short-lived plasmablasts for immediate protection and long-lived plasma cells and memory B cells for persistent protection. [16]

  3. Humoral immunity - Wikipedia

    en.wikipedia.org/wiki/Humoral_immunity

    Step 3: A T helper cell binds to the macrophage and becomes an activated T helper cell. Step 4: The activated T helper cell binds to a B cell in order to activate the B cell. Step 5: When the B cells are activated, some B cells turn into plasma cells and are released in the blood, while other B cells become B memory cells that quicken response ...

  4. T cell - Wikipedia

    en.wikipedia.org/wiki/T_cell

    T cells are grouped into a series of subsets based on their function. CD4 and CD8 T cells are selected in the thymus, but undergo further differentiation in the periphery to specialized cells which have different functions. T cell subsets were initially defined by function, but also have associated gene or protein expression patterns.

  5. Adaptive immune system - Wikipedia

    en.wikipedia.org/wiki/Adaptive_immune_system

    When B cells and T cells are activated some become memory B cells and some memory T cells. Throughout the lifetime of an animal these memory cells form a database of effective B and T lymphocytes. Upon interaction with a previously encountered antigen, the appropriate memory cells are selected and activated.

  6. Cell-mediated immunity - Wikipedia

    en.wikipedia.org/wiki/Cell-mediated_immunity

    Naive T cells, which are immature T cells that have yet to encounter an antigen, are converted into activated effector T cells after encountering antigen-presenting cells (APCs). These APCs, such as macrophages , dendritic cells , and B cells in some circumstances, load antigenic peptides onto the major histocompatibility complex (MHC) of the ...

  7. 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 ...

  8. Immune system - Wikipedia

    en.wikipedia.org/wiki/Immune_system

    When B cells and T cells are activated and begin to replicate, some of their offspring become long-lived memory cells. Throughout the lifetime of an animal, these memory cells remember each specific pathogen encountered and can mount a strong response if the pathogen is detected again.

  9. Lymph node - Wikipedia

    en.wikipedia.org/wiki/Lymph_node

    They present the antigen to T cells and, if there is a T cell with the appropriate T cell receptor, it will be activated. [27] B cells acquire antigen directly from the afferent lymph. If a B cell binds its cognate antigen it will be activated. Some B cells will immediately develop into antibody secreting plasma cells, and secrete IgM. Other B ...

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