FIG. 9.

Hybrid flagella. Two bacteria, one with a normal bundle labeled with Alexa Fluor 532 (orange) and the other with a curly bundle labeled with Alexa Fluor 488 (green), traveled together and then moved apart. In panel A, the green filaments are above the orange filaments, and in panel C, they are below the orange filaments. The green filaments appear to be twisted about the orange ones, pinned at their distal ends. (C and D) As the cells move apart, the bundles unravel and the green filaments bend. The cell bodies are highlighted with the color of their filaments to aid the eye. The images of other cells in the background appear dark. The frames are 1/15 s apart.