1WPK:
reference: The solution structure of the methylated form of the N-terminal 16-kDa domain of Escherichia coli Ada protein., Takinowaki H, Matsuda Y, Yoshida T, Kobayashi Y, Ohkubo T, Protein Sci. 2006 Mar;15(3):487-97. Epub 2006 Feb 1. PMID: 16452614

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