Fig. 3. Time course of growth cone collapse. (A ) Dorsal root ganglion neurons (DRG), (B ) Retinal ganglion cell layer neurons (RET), and (C ) lumbar sympathetic chain neurons (SYMP). One-way analysis of variance for repeated measurements indicated that the time courses of DRG and retinal growth cone collapse after exposure to 0.1 mm tetracaine were significantly different from the time course of each neuron after exposure to 1 mm tetracaine (P < 0.01). *#Significantly different from the value of vehicle exposed neurons at each time point (#P < 0.05, *P < 0.01). Horizontal scale is not time scale. Values are mean ± SD.