2YHS:
reference: Lipids trigger a conformational switch regulating signal recognition particle (SRP)-mediated protein targeting., Stjepanovic G, Kapp K, Bange G, Graf C, Parlitz R, Wild K, Mayer MP, Sinning I, J Biol Chem. 2011 May 3. PMID: 21543314

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