A hierarchical graph representation of the TCR complex. This hierarchical graph represents the TCR complex. Each of the dimeric subunits (TCRαβ, γϵ, δ ϵ, ζζ) is represented as a subgraph. The name of the dimeric subunit is shown in the root node of the corresponding subgraph. Arrows indicate containing relationships. Tyrosine 188 (Y188) belongs to two different linear motifs (the PRS and ITAM of the CD3ϵ chain). Note that only one polypeptide chain is drawn beyond the component molecules level to avoid redundancy.