2CFQ:
reference: Structural evidence for induced fit and a mechanism for sugar/H+ symport in LacY., Mirza O, Guan L, Verner G, Iwata S, Kaback HR, EMBO J. 2006 Mar 22;25(6):1177-83. Epub 2006 Mar 9. PMID: 16525509

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