behavior/neurological
• mice exhibit a lengthened circadian period under constant darkness
• however, mice do not show any differences in locomotor activity during the light phase and dark phase after 1 week in light-dark and mice re-entrain normally over 10 days
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homeostasis/metabolism
• serum corticosterone levels are increased compared to wild-type mice after 0.5h and 1 h of restraint stress
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