gsc11gsc11_grsc4_10 etsi satellite services.ppt 1. GSC: Standardization Advancing Global Communications 1 Satellite Earth Stations and Systems (TC SES) presenterA glioblastoma stem cell (GSC) , GSC11, grows as neurospheres in serum-free media supplemented with EGF (epidermal growth factor) and bFGF (basic fibroblast growth