1WPS:
reference: Structural basis of HutP-mediated anti-termination and roles of the Mg2+ ion and L-histidine ligand., Kumarevel T, Mizuno H, Kumar PK, Nature. 2005 Mar 10;434(7030):183-91. PMID: 15758992

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