PKM and glioblastoma: Figure 5A shows representative images of anchorage-dependent U-87 MG and U-251 MG GBM cells, TS#1 and TS#163 neurospheres and RPE-1 non-cancer cells, after staining with a fluorescent anti-PKM2 MoAb (green) and with DAPI to highlight nuclei (blue), respectively.