3CX3:
reference: AdcAII, a new pneumococcal Zn-binding protein homologous with ABC transporters: biochemical and structural analysis., Loisel E, Jacquamet L, Serre L, Bauvois C, Ferrer JL, Vernet T, Di Guilmi AM, Durmort C, J Mol Biol. 2008 Sep 5;381(3):594-606. Epub 2008 Jun 3. PMID: 18632116

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