MPEG1 and glioblastoma: BLZ945 has recently been shown to target microglia in a mouse proneural GBM model, leading to a regression of established tumors.26 To test BLZ945 in our model, we transplanted mpeg1:EGFP larvae with U87 cells at 3 dpf and incubated these larvae from 4 dpf (1 dpt) in 25 μM BLZ945 for 5 days.