Combining nanoparticles with a chlorotoxin from scorpion venom, scientists at the University of Washington discovered a way to tag brain cancer cells and disable the machinery on the cell’s surface, denying the cancer cells the ability to migrate through the brain. Here, you see tumor cells treated with nanoparticles plus chlorotoxin were the only ones unable to elongate and infiltrate the brain (third column). The other columns show cancer cells that are: untreated; treated with chlorotoxin alone; and treated with nanoparticles alone.