1U3E:
reference: DNA Binding and Cleavage by the HNH Homing Endonuclease I-HmuI., Shen BW, Landthaler M, Shub DA, Stoddard BL, J Mol Biol 2004 Sep 3;342(1):43-56. PMID: 15313606

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