3POJ:
reference: Structural Basis of Mannan-Binding Lectin Recognition by Its Associated Serine Protease MASP-1: Implications for Complement Activation., Gingras AR, Girija UV, Keeble AH, Panchal R, Mitchell DA, Moody PC, Wallis R, Structure. 2011 Nov 9;19(11):1635-43. PMID: 22078562

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