1I9Y:
reference: Specificity determinants in phosphoinositide dephosphorylation: crystal structure of an archetypal inositol polyphosphate 5-phosphatase., Tsujishita Y, Guo S, Stolz LE, York JD, Hurley JH, Cell 2001 May 4;105(3):379-89. PMID: 11348594

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