PARP1 and neoplasm: Upon MMS‐induced DNA damage, we were unable to detect PARylated HMGA2 in Parp1 knockout MEFs but readily showed HMGA2 PARylation in wild‐type MEF cells (Fig. 3F) demonstrating that PARP1 was responsible for DNA damage‐induced PARylation of HMGA2 in our tumor cell models.