5KYH:
reference: Archaeal flagellin combines a bacterial type IV pilin domain with an Ig-like domain., Braun T, Vos MR, Kalisman N, Sherman NE, Rachel R, Wirth R, Schroder GF, Egelman EH, Proc Natl Acad Sci U S A. 2016 Aug 30. pii: 201607756. PMID: 27578865

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