2GE4:
reference: Increasing the accuracy of solution NMR structures of membrane proteins by application of residual dipolar couplings. High-resolution structure of outer membrane protein A., Cierpicki T, Liang B, Tamm LK, Bushweller JH, J Am Chem Soc. 2006 May 31;128(21):6947-51. PMID: 16719475

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