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Figure 1.

Figure 1

Schematic outline of potential changes in neurotrophic factor (NTF) signaling that could contribute to neuronal degeneration. Reduced NTF expression by peripheral targets or central nervous system target neurons, dysfunctional proneurotrophin processing, diminished receptor expression by affected neuronal populations, or decreased anterograde and retrograde transport of NTFs could impair NTF support and further aggravate neuronal dysfunction.