1HMJ:
reference: RNA polymerase subunit H features a beta-ribbon motif within a novel fold that is present in archaea and eukaryotes., Thiru A, Hodach M, Eloranta JJ, Kostourou V, Weinzierl RO, Matthews S, J Mol Biol 1999 Apr 9;287(4):753-60. PMID: 10191143

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