1, phase contrast photomicrograph
2, 3, 4, negatively stained preparations
5, 6, 7, metal shadowing.
1, exponential phase cells
2, cell with two bundles of flagella (arrows)
3, as 2. Both flagellar bundles are attached close to the cell pole
4, a bundle of flagella inserted into the cell in a very small area (large arrow).
The arrowheads point to subgroups of flagella making up the bundle.
Some flagella (small arrow) have been detached by the preparation procedure
5, 6, 7, the two bundles of flagella of each cell are inserted at the same cell pole (s. also 2); they show opposite direction of bending.
(From Jones, W.J., Leigh, J.A., Mayer, F., Woese, C.R., Wolfe, R.S., 1983, Arch. Microbiol. 136, 254-261).