Tangential movement of a granule cell in the bottom level of the EGL. A, During the observation period, the spindle-shaped soma of the granule cell having two long horizontal processes (white arrowheads) migrated toward the left side of the hemisphere. Time interval (in minutes) is indicated on the top right of each photograph. Scale bar, 10 μm. The total distance traversed by the granule cell soma (B), the direction and distance traveled by the soma during each 10 min of the testing period (C), and the length/width ratio of the soma (D) were plotted as a function of elapsed time.