GFAP and glioblastoma: Both male and female tumors were characteristically large at the time of euthanasia (Fig. 1c) and diagnosed as glioblastoma-like based on expression of glial fibrillary acidic protein (Fig. 1d), and standard histological features including invasion (Fig. 1e), necrosis (Fig. 1f) and abundant mitoses (Fig. 1g).