1HDD:
reference: Crystal structure of an engrailed homeodomain-DNA complex at 2.8 A resolution: a framework for understanding homeodomain-DNA interactions., Kissinger CR, Liu BS, Martin-Blanco E, Kornberg TB, Pabo CO, Cell 1990 Nov 2;63(3):579-90. PMID: 1977522

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).