1IQS:
reference: Solution structure of a novel calcium binding protein, MTH1880, from Methanobacterium thermoautotrophicum., Lee CH, Jung JW, Yee A, Arrowsmith CH, Lee W, Protein Sci. 2004 Apr;13(4):1148-54. PMID: 15044740

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