5HCI:
reference: Structure of GPN-loop GTPase Npa3 and implications for RNA polymerase II assembly., Niesser J, Wagner FR, Kostrewa D, Muhlbacher W, Cramer P, Mol Cell Biol. 2015 Dec 28. pii: MCB.01009-15. PMID: 26711263

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