1E0P:
reference: Helix deformation is coupled to vectorial proton transport in the photocycle of bacteriorhodopsin., Royant A, Edman K, Ursby T, Pebay-Peyroula E, Landau EM, Neutze R, Nature 2000 Aug 10;406(6796):645-8. PMID: 10949307

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