3J4T:
reference: Bacterial tubulin TubZ-Bt transitions between a two-stranded intermediate and a four-stranded filament upon GTP hydrolysis., Montabana EA, Agard DA, Proc Natl Acad Sci U S A. 2014 Mar 4;111(9):3407-12. doi:, 10.1073/pnas.1318339111. Epub 2014 Feb 18. PMID: 24550513

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