... examined the role of Chk1, a canonical member of the ATM/ATR pathway, in DNA damage- induced G2 checkpoint control While examining the role of p38 in the G2 checkpoint pathway, we found that inhibition ... many of the key regulators of the cell cycle, including Cdc2/cyclinB complex, now known CDK1 (100) The main goal of cells in the G1 phase of the cell cycle is to prepare for DNA synthesis in the ... (186,200) The isoforms of p38 MAPK are p38 , p38 , p38 and p38 The best-characterized isoforms of p38 are the and isoforms (98) The p38 and p38 proteins are ubiquitously expressed in all cell types,...