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Horizontal (A) and vertical activity (B) in DAT−/−, DAT+/− and DAT+/+ mice measured in an open field test during 6 min. The open field arena was highly illuminated and eight novel objects were placed in the central (center) or the peripheral (periphery) zone of the box. n = 18–38 per group. ** p<0.01 vs. DAT+/+ mice tested with the same location of the objects; ## p<0.01 vs. mice of the same genotype tested with the other location of the objects.
