The Vibrio cholerae FlgM homologue is an anti-sigma28 factor that is secreted through the sheathed polar flagellum.
Correa NE, Barker JR, Klose KE. The Vibrio cholerae FlgM homologue is an anti-sigma28 factor that is secreted through the sheathed polar flagellum. J Bacteriol. 2004 Jul; 186(14):4613-9.