1FW4:
reference: Structure of Escherichia coli fragment TR2C from calmodulin to 1.7 A resolution., Olsson LL, Sjolin L, Acta Crystallogr D Biol Crystallogr 2001 May;57(Pt 5):664-9. PMID: 11320306

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