3TWI:
reference: Variable Lymphocyte Receptor Recognition of the Immunodominant Glycoprotein of Bacillus anthracis Spores., Kirchdoerfer RN, Herrin BR, Han BW, Turnbough CL Jr, Cooper MD, Wilson IA, Structure. 2012 Mar 7;20(3):479-86. PMID: 22405006

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