2PVB:
reference: Crystal structure of the EF-hand parvalbumin at atomic resolution (0.91 A) and at low temperature (100 K). Evidence for conformational multistates within the hydrophobic core., Declercq JP, Evrard C, Lamzin V, Parello J, Protein Sci 1999 Oct;8(10):2194-204. PMID: 10548066

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