NEUROD6 and neoplasm: To assess this idea, we injected 1014 cells into the striatum of conditional knockout mice lacking the CB1R gene selectively in cortical glutamatergic/excitatory neurons (CB1Rfloxed/floxed;Nex1-Cre mice, herein referred to as Glu-CB1R-KO mice), and we analysed tumour growth by magnetic resonance imaging (MRI).