4DAC:
reference: Computational design of a protein crystal., Lanci CJ, Macdermaid CM, Kang SG, Acharya R, North B, Yang X, Qiu XJ, Degrado WF, Saven JG, Proc Natl Acad Sci U S A. 2012 Apr 25. PMID: 22538812

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