Representative video showing a region of interest that was tracked. White box shows the two QDs of different color attached to the same filament moving along actin that provided the data in Fig. 2. Field is 503 × 192 pixels, 1,500 frames acquired at 20-ms exposure time. Playback is set at 200 frames s−1. Each pixel is 86.7 × 86.7 nm. [ATP] = 10 µM.
