5KZL:
reference: Structural and mutational analyses of the Leptospira interrogans virulence-related heme oxygenase provide insights into its catalytic mechanism., Soldano A, Klinke S, Otero LH, Rivera M, Catalano-Dupuy DL, Ceccarelli EA, PLoS One. 2017 Aug 3;12(8):e0182535. doi: 10.1371/journal.pone.0182535., eCollection 2017. PMID: 28771589

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