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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 ...
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]
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.
CD34 is expressed in hematopoietic progenitor cells and endothelial cells of blood vessels. Thus, it has been used as a marker for capillaries and blood vessels. One of the most densely vascular organs is the kidney, wherein networks of capillaries are intertwined with renal tubules.
CD19 is widely expressed during all phases of B cell development until terminal differentiation into plasma cells. During B cell lymphopoiesis, CD19 surface expression starts during immunoglobulin (Ig) gene rearrangement, which coincides during B lineage commitment from hematopoietic stem cell. [8]
The lineage markers are characteristic molecules for cell lineages, e.g. cell surface markers, mRNAs, or internal proteins.Certain antibodies can be used to detect or purify cells with these markers by binding to their surface antigens.
Programmed cell death protein 1 (PD-1), (CD279 cluster of differentiation 279). PD-1 is a protein encoded in humans by the PDCD1 gene. [5] [6] PD-1 is a cell surface receptor on T cells and B cells that has a role in regulating the immune system's response to the cells of the human body by down-regulating the immune system and promoting self-tolerance by suppressing T cell inflammatory activity.
Cluster of differentiation (CD) molecules are markers on the cell surface, as recognized by specific sets of antibodies, used to identify the cell type, stage of differentiation and activity of a cell. KIT is an important cell surface marker used to identify certain types of hematopoietic (blood) progenitors in the bone marrow. To be specific ...