4DC8:
reference: Towards protein-crystal centering using second-harmonic generation (SHG) microscopy., Kissick DJ, Dettmar CM, Becker M, Mulichak AM, Cherezov V, Ginell SL, Battaile KP, Keefe LJ, Fischetti RF, Simpson GJ, Acta Crystallogr D Biol Crystallogr. 2013 May;69(Pt 5):843-51. doi:, 10.1107/S0907444913002746. Epub 2013 Apr 19. PMID: 23633594

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