AQP1 and glioblastoma: Using the direct cell mixture system, we labeled ECV304 cells with PKH26 (shown in red) to distinguish them from GBM cells and to evaluate the formation of cord‐like structures (Figure 4B,C).We found that ECV304 cells cocultured with the U251‐c18 and U87‐c15 cells, GBM clones that express the highest levels of AQP1, formed significantly thicker cord‐like structures compared to ECV304 cells incubated with the respective GBM mock‐infected controls (Figure 4B,C).