4AEY:
reference: FolX from Pseudomonas aeruginosa is octameric in both crystal and solution., Gabrielsen M, Beckham KS, Cogdell RJ, Byron O, Roe AJ, FEBS Lett. 2012 Apr 24;586(8):1160-5. Epub 2012 Mar 24. PMID: 22575651

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