4B4A:
reference: Structure of the TatC core of the twin-arginine protein transport system., Rollauer SE, Tarry MJ, Graham JE, Jaaskelainen M, Jager F, Johnson S, Krehenbrink M, Liu SM, Lukey MJ, Marcoux J, McDowell MA, Rodriguez F, Roversi P, Stansfeld PJ, Robinson CV, Sansom MS, Palmer T, Hogbom M, Berks BC, Lea SM, Nature. 2012 Dec 2. doi: 10.1038/nature11683. PMID: 23201679

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