2I6J:
reference: Enzyme-substrate interactions revealed by the crystal structures of the archaeal Sulfolobus PTP-fold phosphatase and its phosphopeptide complexes., Chu HM, Wang AH, Proteins. 2006 Dec 15;66(4):996-1003. PMID: 17173287

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