1BGS:
reference: Recognition between a bacterial ribonuclease, barnase, and its natural inhibitor, barstar., Guillet V, Lapthorn A, Hartley RW, Mauguen Y, Structure. 1993 Nov 15;1(3):165-76. PMID: 16100951

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