1D8B:
reference: The three-dimensional structure of the HRDC domain and implications for the Werner and Bloom syndrome proteins., Liu Z, Macias MJ, Bottomley MJ, Stier G, Linge JP, Nilges M, Bork P, Sattler M, Structure Fold Des 1999 Dec 15;7(12):1557-66. PMID: 10647186

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