Additional file 4: Figure S2. GFAP immunolabeling on glioblastoma (NG97) cells 1, 12 and 48 h after treatments. This result shows that the cells keep the phenotype from astrocytes origin. In addition, this intermediate filament labeling confirms the morphological alterations induced by the PnV, SF1 and SF11 (D – F, G – I and J – L, respectively), demonstrated also by actin filament labelling by phalloidin probe. Cells were rounder at the beginning, which become more stellate over time. Results of three independent experiments. Bars = 200 µm.