Figure 4.

Force spectroscopy measurement of multiple CS2 fimbriae. The unwinding (black) and rewinding (blue) responses of three simultaneously attached fimbriae, where (a) all three fimbriae are simultaneously extended until the shortest fimbria detaches at ∼4.3 μm, resulting in a force drop to 20 pN; (b) the two remaining fimbriae are further extended until the shorter detaches at ∼6 μm, with a corresponding drop in force to 10 pN; and (c) a single fimbria remains. The blue curve shows the corresponding rewinding response of the single fimbria. To see this figure in color, go online.