2LZS:
reference: Structural model for the protein-translocating element of the twin-arginine transport system., Rodriguez F, Rouse SL, Tait CE, Harmer J, De Riso A, Timmel CR, Sansom MS, Berks BC, Schnell JR, Proc Natl Acad Sci U S A. 2013 Mar 7. PMID: 23471988

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