2O67:
reference: Crystal Structure of Arabidopsis PII Reveals Novel Structural Elements Unique to Plants(,)., Mizuno Y, Berenger B, Moorhead GB, Ng KK, Biochemistry. 2007 Feb 13;46(6):1477-83. PMID: 17279613

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