3U66:
reference: Structural characterization and oligomerization of the TssL protein, a component shared by bacterial type VI and type IVb secretion systems., Durand E, Zoued A, Spinelli S, Watson PJ, Aschtgen MS, Journet L, Cambillau C, Cascales E, J Biol Chem. 2012 Apr 20;287(17):14157-68. Epub 2012 Feb 27. PMID: 22371492

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