1FPW:
reference: Structure and calcium-binding properties of Frq1, a novel calcium sensor in the yeast Saccharomyces cerevisiae., Ames JB, Hendricks KB, Strahl T, Huttner IG, Hamasaki N, Thorner J, Biochemistry 2000 Oct 10;39(40):12149-61. PMID: 11015193

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