CD3
T CELLS
The CD3 antigen is a complex of 5 invariable polypeptidic chains ; g, d, e, z and h whose molecular weights are respectively: 25-28, 20, 20, 16 and 22 kDa.The z chain frequently occurs in the CD3 complex as disulphide linked homodimer. CD3 is part of a bigger complex which includes the T Cell Receptor (TCR). It is expressed by mature T cells and by thymocytes. T cell activation can be induced when foreign antigen is presented to the TCR through MHC complex. These antibodies also have a mitogenic effect on T lymphocytes. They do not react with those T cells lacking the TCR. X35 and UCHT1 antibodies react with the e-chain of the CD3 complex. UCHT1 antibody was evaluated during the First International Workshop on Human Leukocyte Differentiation Antigens. X35 was evaluated during the Third Workshop.

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