2XGA:
reference: Shigella flexneri Spa15 Crystal Structure Verified in Solution by Double Electron Electron Resonance., Lillington JE, Lovett JE, Johnson S, Roversi P, Timmel CR, Lea SM, J Mol Biol. 2010 Nov 12. PMID: 21075116

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