behavior/neurological
• significant shortening of circadian period of behavior in vivo in a gene dose-dependent manner
• homozygous mice have 3.6 hr shorter circadian period than wild-type
• mutant mice are viable and fertile with no overt deleterious phenotype
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nervous system
• significant shortening of circadian period of suprachiasmatic nucleus firing rates in vitro in a gene dose-dependent manner
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