5X1H:
reference: Architecture of the type IV coupling protein complex of Legionella pneumophila., Kwak MJ, Kim JD, Kim H, Kim C, Bowman JW, Kim S, Joo K, Lee J, Jin KS, Kim YG, Lee NK, Jung JU, Oh BH, Nat Microbiol. 2017 Jul 17;2:17114. doi: 10.1038/nmicrobiol.2017.114. PMID: 28714967

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