4BL4:
reference: Further structural insights into the binding of complement factor H by complement regulator-acquiring surface protein 1 (CspA) of Borrelia burgdorferi., Caesar JJ, Wallich R, Kraiczy P, Zipfel PF, Lea SM, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013 Jun;69(Pt 6):629-33. doi: , 10.1107/S1744309113012748. Epub 2013 May 23. PMID: 23722839

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