| 1NQH: reference: Substrate-induced transmembrane signaling in the cobalamin transporter BtuB., Chimento DP, Mohanty AK, Kadner RJ, Wiener MC, Nat Struct Biol 2003 May;10(5):394-401. PMID: 12652322 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).