7. The Circadian Clock (CC) Paces the Mitotic Cell Cycle, DDR Checkpoints, and Reciprocally, the TERT-Dependent Hayflick Limit Count. It Is Absent in ESC, Early Embryo, and Germ Cells and Likely Becomes Dis-Engaged and Then Restored (By Reversible Polyploidy) in Cancer Cells. This evidence concerns the gene TERT and cancer.