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In the present study, we have studied the expression of glial cell line-derived neurotrophic factor (GDNF) and its receptors Ret, GFRα1, and GFRα2 in the retino-tectal system before and after optic nerve transection. Using retrograde neuronal tracing in combination with in situ hybridization, we found that Ret and GFRα1 are expressed by 13-14% of the retinal ganglion cells (RGCs). These Ret-expres
