TEK and glioblastoma: Results demonstrated that in NPCTKO GBM brains, ~7% of tdTomato+ cells in Tek-Cre;Ai14 mice, and ~7% of Tbx18::H2B-GFP+ cells were Ki67+ proliferative cells, whereas matched brain regions on the contralateral side had no marker+/Ki67+ cells (Fig. 6A–D).