Catecholaminergic neurons were transfected with the indicated IC-2C mRFP isoform and imaged the next day as described for Figure 2 and in Methods. Each dynein puncta was defined as being either stationary, exhibiting excursive movement, or exhibiting jiggling movement. Excursive movement is movement for at least 4 frames and at least 1 pixel in each frame. Jiggling movement is any movement that does not last for at least 4 frames, and could be as little as 1 pixel movement between 2 frames. The “All Motility” category graphed in Figure 3 is the sum of excursive and jiggling movement.