2DJM:
reference: Solution structure of family 21 carbohydrate-binding module from Rhizopus oryzae glucoamylase., Liu YN, Lai YT, Chou WI, Chang MD, Lyu PC, Biochem J. 2007 Apr 1;403(1):21-30. PMID: 17117925

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