Structural Insight into Archaic and Alternative Chaperone-Usher Pathways Reveals a Novel Mechanism of Pilus Biogenesis. - Pakharukova, N; Garnett, JA; Tuittila, M; Paavilainen, S; Diallo, M; Xu, Y; Matthews, SJ; Zavialov, AV (PLOS Pathogens, 2015)