1. ON THE CONDITIONS FOR WHICH THE Atm PROTEIN CAN SWITCH OFF THE DNA DAMAGE SIGNAL IN A p53 MODEL. Authors: ZAHRA AFSHARNEZHAD, OMID RABIEIMOTLAGH.2. AN ESTIMATION FOR LOWER BOUND OF p53 IN DNA HEALING PROCESS; A MATHEMATICAL APPROACH. Authors: OMID RABIEIMOTLAGH, ZEINAB TANOURI.