antigen presenting molecules

antigen presenting molecules

The ligands for TCRs are major histocompatibility complex (MHC) proteins. These come in two forms; MHC class I forms a dimer with a molecule called beta-2 microglobulin (β2M) and interacts with the TCR on cytotoxic T cells and MHC class II has two chains (alpha and beta) that interact with the TCR on helper T cells. MHC class I, MHC class II and β2M molecules all possess Ig domains and are therefore also members of the IgSF.

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