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Natural killer (NK) cells are a type of lymphocyte cell involved in the innate immune system's response to viral infection and tumor transformation of host cells. [20] [7] Like T cells, NK cells have many qualities characteristic of the adaptive immune system, including the production of “memory” cells that persist following encounter with antigens and the ability to create a secondary ...
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The genes responsible for coding of KIR proteins are found along the 19th chromosome section 19q 13.4 within the 1Mb Leukocyte Receptor Complex (LRC). The subsets of the KIR proteins are classified by their number of extracellular IG domains and by whether they have a long (L) or short (S) cytoplasmic domain-tail.
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At first, it was thought that there was only one KAR and one KIR receptor present on the NK cell, known as the two-receptor model. [2] In the last decade, many different KARs and KIRs, such as NKp46 or NKG2D, have been discovered creating the opposing-signals model. [1] NKG2D is activated by the cell-surface ligands MICA and ULBP2. [5]
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The ligands for several KIR proteins are subsets of HLA class I molecules; thus, KIR proteins are thought to play an important role in regulation of the immune response. [5] KIR2DS4 is a product of a gene conversion with KIR3DL2. [6] KIR2DS4 has unusual HLA-I specificity binding some HLA-C allotypes and HLA-A*11. [6]