Rottlerin and SP600125 decreased the migration rate of locomoting neurons. A–E, time-lapse observation of locomoting neurons in cultured cortical tissues with or without rottlerin (1 or 5 μm), safingol, or SP600125. Cortical slices were cultured without any inhibitors for the first 4 h as an internal control (white arrowheads). Subsequently, we added the indicated inhibitors into cultured media (red arrows), and continued to observe the same locomoting neurons for an additional 4 h (red arrowheads). Green, EGFP; red, DsRed with NLS; scale bar, 20 μm.