Toxin with unknown function in healthy organisms. On glioma cells, interacts with chloride channels (probably ClC-3/CLCN3) and MMP2 at the surface of glioma cells. This complex is then internalized via caveolae, thus inhibiting the chloride channels necessary for cell shrinkage and tumor propagation (By similarity). Inhibits migration and invasion of U87 glioma cells expressing CLCN3/ClC-3 voltage-gated chloride channels. Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Intracerebroventricular injection into mice does not induce neurotoxicity (up to 1 ug doses). Belongs to the short scorpion toxin superfamily. Chloride channel inhibitor family.