gsc11gsc11_grsc4_10 etsi satellite services.ppt 1. GSC: Standardization Advancing Global Communications 1 Satellite Earth Stations and Systems (TC SES) presenterGSC11 and GSC23 were orinally derived from fresh surgical specimens of adult glioblastoma multiforme and maintained in serum-free neural sphere culture medium (184, 185). GBM3752