6F8L:
reference: Structural cycle of the Thermus thermophilus PilF ATPase: the powering of type IVa pilus assembly., Collins R, Karuppiah V, Siebert CA, Dajani R, Thistlethwaite A, Derrick JP, Sci Rep. 2018 Sep 19;8(1):14022. doi: 10.1038/s41598-018-32218-3. PMID: 30232337

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