3E9U:
reference: Crystal structure of CBD2 from the Drosophila Na(+)/Ca(2+) exchanger: diversity of Ca(2+) regulation and its alternative splicing modification., Wu M, Wang M, Nix J, Hryshko LV, Zheng L, J Mol Biol. 2009 Mar 20;387(1):104-12. Epub 2009 Jan 29. PMID: 19361442

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