3VF1:
reference: Structure of a calcium-dependent 11R-lipoxygenase suggests a mechanism for Ca2+-regulation., Eek P, Jarving R, Jarving I, Gilbert NC, Newcomer ME, Samel N, J Biol Chem. 2012 May 9. PMID: 22573333

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