1I57:
reference: The structure of apo protein-tyrosine phosphatase 1B C215S mutant: more than just an S --> O change., Scapin G, Patel S, Patel V, Kennedy B, Asante-Appiah E, Protein Sci 2001 Aug;10(8):1596-605. PMID: 11468356

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