Signals from a brain clock cell group controlling daily movement rhythms

Cholecystokinin (CCK) is expressed in a subset of neurons within the suprachiasmatic nucleus (SCN).

• The SCN functions as the primary regulator of circadian rhythms in mammals.
• Different types of neurons within the SCN have unique roles in controlling daily behaviors and physiological processes.
• The specific contribution of CCK-expressing neurons to locomotor activity rhythms is currently unclear.

Simplified