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Fig. 4. NTF-dependent and NTF-independent types of axonal growth do not differ in axonal morphology. Neurons cultured for 12 hours in the presence, or for 40 hours in the absence, of NGF exhibit similar mean values of total axonal length (A) and number of branches (B). (C) Distribution of total length and number of branches of the longest axon of each neuron at 12 hours in the presence of NGF (squares) and at 40 hours in the absence of NGF (triangles). The data are presented for 40 neurons from four independent experiments; the data in A and B are means ± s.e.m.