SOX2 and glioblastoma: To see whether the human SOX2 binding regions in GBM cells have their own unique and enriched binding motif, we used the MotifSampler program (http://bioinformatics.psb.ugent.be/webtools/plantcare/html/Motif_Sampler.html) to identify binding consensus sequences enriched in the SOX2 binding regions that we identified.