behavior/neurological
• the circadian period in DD conditions is significantly shorter in mutants, 23.50 hours compared to 23.90 hours in wild-type littermates
• the duration of the active period increased under DD conditions so that after 3 weeks rhythmicity is lost
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vision/eye
• appearance of cell bodies in the plexiform layers
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nervous system
• abnormal pyramidal layer; dispersed and often split
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• reduced granule cell number, disorganized granule cell layer and abnormal migration of granule cell precursors
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• approximately half the size of heterozygous littermates
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• reduced length of lobule IV
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