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These diagrams show the results of Dunnett's experiment :

• note the high level of rotation in the Lesion group
• contrast this with the low level of rotation in the Intact group
• grafts of DA -producing cells overcome the effects of the lesion
• grafts of serotonin ( 5-HT )-producing cells do not overcome the effects of the lesion
• grafts of caudate-putamen cells ( CPu ) do not overcome the effects of the lesion