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(English) The poison found in tetrodotoxic fishes; also called spheroidine, fugu toxin, or puffer poison. The empirical molecular formula is approximately C11 H17 O8 YH20. It is among the most toxic substances known among the non-proteins. It is a sodium channel blocker, preventing transmission of pain signals and is being examined as a non-addictive pain suppressor, 3000 times more powerful than morphine. (See also: tetrodotoxic fishes, tetrodotoxication, spheroidine)

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