2GKG:
reference: An atypical receiver domain controls the dynamic polar localization of the Myxococcus xanthus social motility protein FrzS., Fraser JS, Merlie JP Jr, Echols N, Weisfield SR, Mignot T, Wemmer DE, Zusman DR, Alber T, Mol Microbiol. 2007 Jul;65(2):319-32. Epub 2007 Jun 15. PMID: 17573816

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