1GFY:
reference: Residue 259 is a key determinant of substrate specificity of protein-tyrosine phosphatases 1B and alpha., Peters GH, Iversen LF, Branner S, Andersen HS, Mortensen SB, Olsen OH, Moller KB, Moller NP, J Biol Chem 2000 Jun 16;275(24):18201-9. PMID: 10748206

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