PARP1 and fibrosarcoma: We detected PARylated HMGA2 in the PARylated protein fraction of MDA‐MB‐231 transfectants with stable expression of exogenous HMGA2 (Fig. 3E) and in MDA‐MB‐436 and C1 fibrosarcoma cells (data not shown), both with endogenous HMGA2 expression, indicating that HMGA2 is PARylated upon PARP activation.