Adaptation to photoperiod via dynamic neurotransmitter segregation - Nature
Briefly

Changes in photoperiod impact physiology and behavior. A brain circuit with specific neurotransmitter deployment regulates adaptation to photoperiod change.
Neurons in the brainstem median raphe nucleus segregate serotonin and glutamate to different axonal branches based on photoperiod change, influencing sleep-wake timing.
Read at Nature
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