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The effects of apomorphine administration on cage displacement in the startle boxes in the absence of a startle-eliciting stimulus (no-stimulus trial) in the Sprague Dawley (filled circles; n = 12/group) and Wistar (open circles;n = 10/group) rat strains. The effects of apomorphine on this measure were identical in the two rodent strains. An asterisk indicates significantly different from vehicle (p < 0.05).
