highly related cell-surface proteins of the immunoglobulin superfamily containing a single extracellular immunoglobulin domain.

A structure of the extracellular and transmembrane regions of the CD3??/CD3??/CD3??/TCR?? complex was solved with CryoEM, showing for the first time how the CD3 transmembrane regions enclose the TCR transmembrane regions in an open barrel.

Containing aspartate

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