The TRDC C-DOMAIN is shown in two different orientations.
Side view (backbone model)
A C-DOMAIN corresponds to the complete C-REGION, to most of the C-REGION, or to part of the C-REGION, depending on the immunoglobulin or T cell receptor chain type.
This figure shows the C-DOMAIN of a delta chain (PDB: 1hxm_A) of a gamma-delta T cell receptor. Only the C-DELTA, part of the TRD C-REGION, is displayed. The carbohydrates are not shown.
In the PDB file, the sequence includes 17 amino acids of the CONNECTING-REGION of the delta chain, however, the 3D structure only includes C-DELTA amino acids up to position 120 (according to the IMGT unique numbering for C-DOMAIN and C-LIKE-DOMAIN).
The strands C, F and G are on the external face of C-DELTA. Strands A, B , D and E are on the interface with the C-GAMMA in the gamma-delta T cell receptor.
This image has been generated with the program RASMOL version 2.6  from the PDB file 1hxm , containing the atomic coordinates of the crystal structure of a human Vgamma9/Vdelta2 T cell receptor.
 Sayle, R. and Milner-White, E.J. TIBS, 20, 374 (1995).
 Allison, T.J. et al., Nature, 411, 820-824 (2001).