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Each cell membrane can have several kinds of membrane receptors, with varying surface distributions. A single receptor may also be differently distributed at different membrane positions, depending on the sort of membrane and cellular function. Receptors are often clustered on the membrane surface, rather than evenly distributed. [5] [6]
The CD system is commonly used as cell markers in immunophenotyping, allowing cells to be defined based on what molecules are present on their surface. These markers are often used to associate cells with certain immune functions. While using one CD molecule to define populations is uncommon (though a few examples exist), combining markers has ...
In response to an injury, endothelial cells will express selectin, which binds to glycans present on the leukocyte cell surface. [7] Platelet cells, which are involved in tissue repair, use their selectins to associate with leukocytes on the way to the endothelial cells. [ 7 ]
Like many cell surface receptors/markers, CD4 is a member of the immunoglobulin superfamily. It has four immunoglobulin domains (D 1 to D 4) that are exposed on the extracellular surface of the cell: D 1 and D 3 resemble immunoglobulin variable (IgV) domains. D 2 and D 4 resemble immunoglobulin constant (IgC) domains.
Lineage markers include mitochondrial DNA and Y-chromosome short tandem repeat haplotypes that are transferred directly from generation to generation either from mother to child in the case of mtDNA, or from father to son in the case of the Y-chromosome. X-chromosome markers are another tool that can be used for genetic identity testing ...
CD38 was first identified in 1980 as a surface marker (cluster of differentiation) of thymus cell lymphocytes.[10] [11] In 1992 it was additionally described as a surface marker on B cells, monocytes, and natural killer cells (NK cells). [10]
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The antigen Thy-1 was the first T cell marker to be identified. Thy-1 was discovered by Reif and Allen in 1964 [5] during a search for heterologous antisera against mouse leukemia cells, and was demonstrated by them to be present on murine thymocytes, on T lymphocytes, and on neuronal cells.