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A T cell is a type of lymphocyte which developes in the thymus gland and plays a central role in the immune response.T cells can be distinguished from other lymphocytes by the presence of a T-cell receptor on the cell surface.These immune cells originate as precursor cells, derived from bone marrow, and develop into several distinct types of T cells once they have migrated in to the thymus ...
The sub populations of T cells with functional difference can be identified by means of surface markers (CD markers) or antigens. Approximately 60 – 65% of mature T cells that leave the thymus display CDn”, CD3+, CD4+ and CDS~ markers on their surface and are generally referred as CD4 cells or TH cells or T helper cells.
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Before answering your question, I’d like to emphasize that the number of T cell type depends on how you categorize them. Basically, there are 2 requirements for a cell population to be categorized as a unique one. 1) That population has some uniqu...
T cell, type of leukocyte (white blood cell) that is an essential part of the immune system. T cells are one of two primary types of lymphocytes—B cells being the second type—that determine the specificity of immune response to antigens (foreign substances) in the body. T cells originate in the
Helper T cells direct the immune system. In a rather lengthy process, helper T cells release cytokines. Cytokines stimulate B cells to form plasma cells. Plasma cells form antibodies, which stimulate the production of two other types of T cells: cytotoxic T cells and suppressor T cells. Helper T cells are the cells attacked by the AIDS virus.
T cells can be divided into three main subtypes: effector, memory, and regulatory cells. Each type performs a distinct function during an immune response to foreign antigens. T cells subtypes are differentiated by the expression of unique cell surface markers, such as CD4 for helper T cells and CD8 for cytolytic or cytotoxic T cells. Key Terms
T-cells are part of the body's cell-mediated immunity, the part of the immune system which you can envision as directly killing bacteria, viruses, and cancer cells.The other type—humoral immunity—protects our bodies from these invaders by making antibodies.
The devastating effects of a lower than normal number of just one type of T-cell are all too evident in HIV/AIDS. There are several different kinds of T-cell; broadly speaking they can be divided into two different types, killer T-cells and helper T-cells. Killer T-cells have ‘X-ray vision’ as they are able to see inside our bodies own ...