MCM2 and glioblastoma: 2012). We therefore investigated whether cell cycle arrest is contributing to the reduction in cell viability and confluence observed in the GBM cultures after Q‐PAC treatment. After quantifying the expression of minichromosome maintenance 2 (MCM2), part of the DNA replication machinery that is only expressed in proliferating cells (Williams and Stoeber 2007), we found that 48 h of Q‐PAC treatment did not alter the proportion of MCM2‐positive U87 or primary GBM cells (Figure S7c).