gsc11Gsc11_grsc4_10 Etsi Satellite Services (1) - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides on. The document discussesGSC11 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