1. A method for enriching for neural stem cells or a more restricted subset of progenitors, comprising: identifying cells with at least one positive and/or negative neural stem cell markers from a population of cells; and enriching said cells for cells lacking said negative neural stem cell marker and/or having a said positive neural stem cell marker, wherein said positive or negative neural stem cell marker is a marker selected from the group consisting of ganglioside GD2, and ganglioside GD3, thereby obtaining a population of cells enriched for neural stem cells (NSCs) or a subset of progenitors of neural cells more restricted than NSCs.