Wasabi Receptor Toxin is a cell-penetrating scorpion toxin. Wasabi Receptor Toxin is the activator for TRPA1 ion channel with EC 50 in nanomolar level, and prolongs the channel open time, but reduces Ca 2+ permeability. Wasabi Receptor Toxin causes thermal hypersensitivity and mechanical allodynia in rats, without triggering neurogenic inflammation.