3AQO:
reference: Structure and function of a membrane component SecDF that enhances protein export., Tsukazaki T, Mori H, Echizen Y, Ishitani R, Fukai S, Tanaka T, Perederina A, Vassylyev DG, Kohno T, Maturana AD, Ito K, Nureki O, Nature. 2011 May 11;474(7350):235-8. doi: 10.1038/nature09980. PMID: 21562494

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