2GJ0:
reference: A novel suite of cyclotides from Viola odorata: sequence variation and the implications for structure, function and stability., Ireland DC, Colgrave ML, Craik DJ, Biochem J. 2006 Nov 15;400(1):1-12. PMID: 16872274

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