FASLG and glioblastoma: Chaetocin effectively sensitized GBM cells, as well as U87MG-TR cells (Supplementary Fig. 3A) to FasL, another extrinsic apoptosis ligand (Fig. 3a–d, Supplementary Videos 5–8), as revealed by end-point cell viability assays (Fig. 3a, b) and live cell imaging (Fig. 3c, d).