2ERH:
reference: Computational Design of a New Hydrogen Bond Network and at Least a 300-fold Specificity Switch at a Protein-Protein Interface., Joachimiak LA, Kortemme T, Stoddard BL, Baker D, J Mol Biol. 2006 Aug 4;361(1):195-208. Epub 2006 May 24. PMID: 16831445

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