4I84:
reference: Structure of the secretion domain of HxuA from Haemophilus influenzae., Baelen S, Dewitte F, Clantin B, Villeret V, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013 Dec;69(Pt 12):1322-7. doi:, 10.1107/S174430911302962X. Epub 2013 Nov 28. PMID: 24316822

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