Gallery Scientific GFAP isoform in GBM Image 1 of 14 Glial Fibrially Acidic Protein (GFAP) isoforms in Glioblastoma Multiforme (GBM) tumor tissue section. Immunostained for GFAPalpha (Green) and delta (red), counterstained with Hoechst (DAPI, blue) Lab Life Preparing tissue for visualisation Image 7 of 8