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Da ich keine Ahnung von Bio-Chemie habe, hab ich mal schnell in Wikipedia nachgeschlagen.
The prevalence of TTX-s Na+ channels in the central nervous system makes tetrodotoxin a valuable agent for the silencing of neural activity within a cell culture.
...Tetrodotoxin has proved useful in the treatment of pain (originally used in Japan in the 1930s) from such diverse problems as terminal cancer,[10] migraines, and heroin withdrawal.[11]