2KI4:
reference: The heterohexameric complex structure, a component in the non-classical pathway for fibroblast growth factor 1 (FGF1) secretion., Mohan SK, Rani SG, Yu C, J Biol Chem. 2010 May 14;285(20):15464-75. Epub 2010 Mar 10. PMID: 20220137

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