Slowdown of tangential movement of a granule cell with longer horizontal processes. A, During the period of observation, the cell with longer horizontal processes moved toward the right side of the hemisphere at a reduced rate of 9.1 μm/hr. Interestingly, the cell did not protrude filopodia and lamellipodia from its cell body and horizontal processes. Time interval (in minutes) is indicated on the top right of each photograph. Scale bars, 10 μm. B, A photograph representing the long horizontal process of tangentially migrating granule cell shown inA. The total distance traversed by the granule cell soma (C), the direction and distance traveled by the soma during each 10 min of the testing period (D), and the length/width ratio of the soma (E) were plotted as a function of elapsed time.