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The effects of apomorphine administration (top, vehicle; middle, 0.3 mg/kg;bottom, 0.6 mg/kg) on locomotor activity in the Sprague Dawley (filled circles) and Wistar (open circles) strains of rat. The locomotor response to apomorphine administration was identical in the two rat strains. Cage crossings were defined as two consecutive beam breaks in photocell beams along the bottom of the cage floor. Error bars represent SEM (n = 8/group).
