Plays a role in neurite development, may be through the activation of the GTPase RAC1. Plays a role in the control of eye movement and gaze stability. In undifferentiated neurons, located in the actin-rich regions of the cell body. In differentiated neurons, located in the actin-rich regions of the cell body and primary neurite processes but is almost absent from secondary extensions arising from the primary neurite. Also found at the actin-rich distal end of growth cones. In the developing cerebral cortex, strong expression is observed in the ventricular and intermediate zones at 13 and 17 dpc. At 17 dpc and P0, expression appears to be restricted to the cortical plate. In neonates, highly expressed in cortex, hippocampus, cerebellum, olfactory bulb and eye with little or no expression in liver, kidney, skeletal muscle or heart muscle (at protein level). Up-regulated during retinoic acid-induced differentiation of neuroblastoma cells. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus.