Structure of the flagellum of Bdellovibrio bacteriovorus

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Abstract
The Bdellovibrio flagellum is of uniform width (about 28 m/i) and typically possesses a decreasing amplitude and wavelength proceeding from the cell toward the flagellum tip; less ordered arrangements of flagella are also observed. The flagellum originates within the cell wall. Negatively stained preparations of the flagella show that it consists of: an inner core approximately 13 m/i in thickness and an outer sheath consisting of 2 dense regions separated by a less dense zone. The sheath thickness is approximately 7.5 m/i.