2NOV:
reference: Breakage-Reunion Domain of Streptococcus pneumoniae Topoisomerase IV: Crystal Structure of a Gram-Positive Quinolone Target., Laponogov I, Veselkov DA, Sohi MK, Pan XS, Achari A, Yang C, Ferrara JD, Fisher LM, Sanderson MR, PLoS ONE. 2007 Mar 21;2:e301. PMID: 17375187

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