6GKX:
reference: Crystal Structures of R-Type Bacteriocin Sheath and Tube Proteins CD1363 and CD1364 From Clostridium difficile in the Pre-assembled State., Schwemmlein N, Pippel J, Gazdag EM, Blankenfeldt W, Front Microbiol. 2018 Aug 3;9:1750. doi: 10.3389/fmicb.2018.01750. eCollection, 2018. PMID: 30127773

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