behavior/neurological
• mice show decreased freezing in the context test compared to wild-type mice
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• mice show decreased freezing in cued tests compared to wild-type mice
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• decrease in magnitude in response to 90?110 dB(A) pulse intensities
• however, response to 115 and 120 dB(A) pulses was similar to controls
• haloperidol has no effect on the startle response defect
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• most mice show occasional front paw clasping
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• increase in time spent awake
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• more frequent episodes of vigilance states that are shorter in duration compared to wild-type controls
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hearing/vestibular/ear
N |
• no defect in auditory evoked potential responses at 65, 68, 70 or 80 dB
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nervous system
• expression analysis indicates impaired differentiation of cultured neuronal precursor cells
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• cultured neuronal precursor cells show enhanced proliferation
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• in cortical pyramidal neurons and dentate granule cells of the hippocampus
• fewer mature but not immature dendritic spines in cortical pyramidal neurons
• however, pyramidal neurons in the hippocampal CA1 region show normal dendritic spine densities
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• profound defect in PPI using 100 ms prepulse intervals and three prepulse intensities and when using a single 85 dB(A) prepulse intensity and 25-500 ms prepulse intervals
• haloperidol has no effect on the PPI defect
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cellular
• expression analysis indicates impaired differentiation of cultured neuronal precursor cells
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• cultured neuronal precursor cells show enhanced proliferation
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