IGFBP7 and glioblastoma: Sections from GBM tumour-bearing mice receiving anti-IGFBP7 sdAb-PEGylated NPs-Cy5.5 demonstrated Cy5.5 fluorescence (red) in the tumour region, colocalising with the tomato-lectin-stained vessels (green) (Figure 7A) compared with virtual absence of Cy5.5 fluorescence in tumour sections from animals injected with non-targeted PEGylated NPs-Cy5.5 (Figure 7B).