Flow cytometry (FACS) and magnetic bead cell sorting (MACS) to characterize the composition (in terms of relative size of specific neuroprogenitor-like cell populations) of human gliomas taken from the OR and isolate specific subpopulations of neuroprogenitor-like cells within these tumors and use immunohistochemistry to analyze these subpopulations in terms of their expression of intracellular and extracellular markers of malignancy