antigen receptors

antigen receptors

Antigen receptors found on the surface of T and B lymphocytes in all jawed vertebrates belong to the IgSF. Immunoglobulin molecules (the antigen receptors of B cells) are the founding members of the IgSF. In humans, there are five distinct types of immunoglobulin molecule all containing a heavy chain with four Ig domains and a light chain with two Ig domains. The antigen receptor of T cells is the T cell receptor (TCR), which is composed of two chains, either the TCR-alpha and -beta chains, or the TCR-delta and gamma chains. All TCR chains contain two Ig domains in the extracellular portion; one IgV domain at the N-terminus and one IgC1 domain adjacent to the cell membrane.

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