Immunoglobulin (Ig)-like domain of CD3 epsilon chain
Ig_CD3_epsilon; immunoglobulin (Ig)-like domain of CD3 epsilon chain. CD3 is a T cell surface receptor that is associated with alpha/beta T cell receptors (TCRs). The CD3 complex consists of one gamma, one delta, two epsilon, and two zeta chains. The CD3 subunits form heterodimers as gamma/epsilon, delta/epsilon, and zeta/zeta. The gamma, delta, and epsilon chains each contain an extracellular Ig domain, whereas the extracellular domains of the zeta chains are very small and have unknown structure. The CD3 domain participates in intracellular signalling once the TCR has bound an MHC/antigen complex.