The type IV pilin, PilA, is required for full virulence of Francisella tularensis subspecies tularensis. - Forslund AL; Salomonsson EN; Golovliov I; Kuoppa K; Michell S; Titball R; Oyston P; Noppa L; Sjöstedt A; Forsberg A (BMC microbiology, 2010)