1SUG:
reference: Water-molecule network and active-site flexibility of apo protein tyrosine phosphatase 1B., Pedersen AK, Peters G GH, Moller KB, Iversen LF, Kastrup JS, Acta Crystallogr D Biol Crystallogr 2004 Sep;60(Pt 9):1527-34. Epub 2004, Aug 26. PMID: 15333922

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