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Photomicrographs of GDNF-immunoreactivity in the striatum. Vehicle animals (a) showed no GDNF immunoreactivity in the striatum, while GDNF immunoreactivity was present in the striatum of GDNF (2 wk) (b), GDNF (4 wk) (c), and GDNF (8 wk) (d) treated animals.
