1XSW:
reference: A Concept for Rapid Protein-Structure Determination by Solid-State NMR Spectroscopy., Lange A, Becker S, Seidel K, Giller K, Pongs O, Baldus M, Angew Chem Int Ed Engl 2005 Mar 29;44(14):2089-2092. PMID: 15744789

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