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Abstract 


The influence of pimozide on the effects of apomorphine on locomotor activity and stereotypy was studied in two inbred strains of mice. In C57BL/6 mice, in which apomorphine did not produce stereotypy of gnawing, the biphasic effect of apomorphine on locomotor activity (hypomotility followed by hypermotility) was unaffected by pimozide. In DBA/2 mice, in which high doses of apomorphine produce hypomotility and compulsive gnawing, both these effects (but not hypomotility produced by low doses of apomorphine) were counteracted by pimozide. The results are consistent with the assumption that both strains of mice have separate inhibitory and stimulatory dopamine receptors mediating locomotor activity. In addition, DBA/2 but not C57BL/6 mice have dopamine receptors which mediate stereotypy and are sensitive to pimozide.

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