3SQC:
reference: The structure of the membrane protein squalene-hopene cyclase at 2.0 A resolution., Wendt KU, Lenhart A, Schulz GE, J Mol Biol 1999 Feb 12;286(1):175-87. PMID: 9931258

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