Circadian rhythm regulates the function of immune cells and participates in the development of tumors | Cell Death Discovery,The phosphorylation switch that regulates ticking of the circadian clock: Molecular Cell,Emerging Role of ABC Transporters in Glia Cells in Health and Diseases of the Central Nervous System,4,391 Lawrence Taylor Photos & High Res Pictures - Getty Images,Neurobiology of Circadian Rhythm Regulation - Sleep Medicine Clinics