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From Biology-Online Dictionary | Biology-Online Dictionary
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(Science: molecular biology) drosophila gene essential for the production of circadian rhythms.

The protein product, TIM, may be necessary for the accumulation of the PER protein, the product of the per gene. TIM and PER associate with one another and the regulated interaction seems to determine the entry of PER into the nucleus: both TIM and PER are produced in a circadian cycle.