As supported by Uren et al.40 Sakakibara et al.58 and Katz et al.93, in glioblastoma, mouse neural progenitor and mouse E12.5 neural stem cells from transgenic mice with a Dox-inducible Msi1 allele respectively, we found that while NUMB was expressed in our system, it was not eCLIP-bound by endogenous MSI1 in SU_MB002 nor NSC201cb. This evidence concerns the gene MSI1 and glioblastoma.