2HF5:
reference: Calcium-induced folding of a fragment of calmodulin composed of EF-hands 2 and 3., Lakowski TM, Lee GM, Okon M, Reid RE, McIntosh LP, Protein Sci. 2007 Jun;16(6):1119-32. Epub 2007 May 1. PMID: 17473011

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