DNA damage_ATM/ATR regulation of G1/S checkpoint. It is the highest scoring map (i.e., the map with the lowest p value). ATM/ATR regulates both the checkpoints of the G1/S and S/G2. DNA damage checkpoints pathways arrest or delay the progression of cell cycle in response to the DNA damage. Eukaryotic cell cycle have four phases, G1 (G indicating gap), S (Synthesis), G2 (Gap 2), and M (Mitosis), and one outside, G0 (Gap 0).