1AVJ:
reference: Comparative modeling of the three-dimensional structure of the calmodulin-related TCH2 protein from Arabidopsis., Khan AR, Johnson KA, Braam J, James MN, Proteins 1997 Jan;27(1):144-53. PMID: 9037719

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