The Structure of CD4
The CD4 antigen was first identified by the W3/25 monoclonal antibody (mAb) in the rat and indeed was one of the first lymphocyte cell surface antigens to be defined by monoclonal antibodies in any species (Williams et al. 1977). The W3/25 mAb was of particular interest as it was the first marker for the sub-population of T lymphocytes with “helper” activity (White et al. 1978). The human homologue of the W3/25 antigen was identified with the mAb T4 (Reinherz et al. 1979) and later termed CD4. The CD (clusters of differentiation) nomenclature was introduced as a simple method to group together mAbs that recognised the same antigen at the surface of human leucocytes (Bernard et al. 1984). This nomenclature is now widely used to describe both the antibody recognising the antigen and the antigen itself. It is also used to describe homologues in species other than humans.
KeywordsChinese Hamster Ovary Cell Immunoglobulin Superfamily Disulphide Bridge Lymphocyte Activation Gene IgSF Domain
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