1KRF:
reference: Structure of Penicillium citrinum alpha 1,2-mannosidase reveals the basis for differences in specificity of the endoplasmic reticulum and Golgi class I enzymes., Lobsanov YD, Vallee F, Imberty A, Yoshida T, Yip P, Herscovics A, Howell PL, J Biol Chem 2002 Feb 15;277(7):5620-30. PMID: 11714724

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