5KTG:
reference: Assembly of Bak homodimers into higher order homooligomers in the mitochondrial apoptotic pore., Mandal T, Shin S, Aluvila S, Chen HC, Grieve C, Choe JY, Cheng EH, Hustedt EJ, Oh KJ, Sci Rep. 2016 Aug 4;6:30763. doi: 10.1038/srep30763. PMID: 27488021

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