2FSH:
reference: Structure of Dimeric SecA, the Escherichia coli Preprotein Translocase Motor., Papanikolau Y, Papadovasilaki M, Ravelli RB, McCarthy AA, Cusack S, Economou A, Petratos K, J Mol Biol. 2007 Mar 9;366(5):1545-57. Epub 2006 Dec 23. PMID: 17229438

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