Brain Tumors and Normal Neural Progenitor Cells used in study.

Brain tumours were acquired directly from surgery, dissociated and cells were expanded in culture. First neuropathological review of the tumour tissue was followed by a second independent review. Patient ages listed in years (y). Non tumour tissue was from premature infants, listed in gestational weeks (gw), who died shortly after birth; periventricular zone tissue from the head of the caudate nucleus was isolated and initially characterized by Schwartz et al. (2003); no gross or microscopic abnormalities were observed at this time.