4IGL:
reference: The BC component of ABC toxins is an RHS-repeat-containing protein encapsulation device., Busby JN, Panjikar S, Landsberg MJ, Hurst MR, Lott JS, Nature. 2013 Aug 4. doi: 10.1038/nature12465. PMID: 23913273

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