behavior/neurological
• display increased activity during subjective night when maintained in constant darkness
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• under conditions of constant light, period length increases more slowly in response to lower irradiance levels compared to controls
• however, under conditions of constant darkness period length is not dfferent from controls
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• under conditions of constant light, mice exhibit a dramatic delay in activity onset at the lowest irradiance level tested
• significantly enhanced phase delays to light exposure beginning at expected dark (ZT12) at low irradiance levels but not at higher irradiance levels
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