4CII:
reference: Structure of a three-dimensional domain-swapped dimer of the Helicobacter pylori type IV secretion system pilus protein CagL., Barden S, Schomburg B, Conradi J, Backert S, Sewald N, Niemann HH, Acta Crystallogr D Biol Crystallogr. 2014 May;70(Pt 5):1391-400. doi:, 10.1107/S1399004714003150. Epub 2014 Apr 30. PMID: 24816107

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