The analysis of H&E and GFAP sections of NS/CT-2A tumors demonstrated the presence of malignant and highly proliferative brain neoplasms of glial origin (Fig. S2) neuropathologically behaving like a high-grade anaplastic astrocytoma, probably in transition to a GBM in the light of the high mitotic activity. Here, GFAP is linked to anaplastic astrocytoma.