In order to investigate the relationship between EGFR and Axl in GBM cells, we first explored Axl activation (through residue-specific phosphorylation) in serum-starved SNB-19 cells in response to stimulation by the growth factors EGF, PDGF and FGF, over a time course of 0-60 min. The gene discussed is EGF; the disease is glioblastoma.