"For example, tetrodotoxin (TTX) and saxitoxin (STX) selectively block voltage-gated sodium channels, thereby preventing the production of action potentials; paralysis and death rapidly follow. Tetrodotoxin is found in the ovaries of the puffer fish, which is esteemed as a delicacy in Japan. If the ovaries of the puffer fish are not removed properly and if the fish is not cleaned with great care, people who eat it may be poisoned by TTX" (Breedlove, Watson, & Rosenweig, 2010).
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