The deposited structure of PDB entry 4hri coloured by chain, front view. This structure contains:

• 2 copies of DNA-binding transcriptional activator HetR;
• 1 copy of DNA (5'-D(P*GP*CP*GP*AP*GP*GP*GP*GP*TP*CP*TP*AP*AP*CP*CP*CP*CP*TP*CP*AP*T)-3');
• 1 copy of DNA (5'-D(P*AP*TP*GP*AP*GP*GP*GP*GP*TP*TP*AP*GP*AP*CP*CP*CP*CP*TP*CP*GP*C)-3');
• 2 copies of CALCIUM ION;
• 1 copy of water.