1SI8:
reference: The three-dimensional structure of catalase from Enterococcus faecalis., Hakansson KO, Brugna M, Tasse L, Acta Crystallogr D Biol Crystallogr. 2004 Aug;60(Pt 8):1374-80. Epub 2004, Jul 21. PMID: 15272159

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