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1 A neurotoxin is a toxic agent or substance that inhibits, damages or destroys the tissues of the nervous system, especially neurons, the conducting cells of your body's central nervous system. 2  This is an example of a cytotoxin.
An example of a neurotoxin is the toxin secreted. by Clostridium botulinum, the most poisonous substance known. The fatal dose of botulinum toxin A by. injection or inhalation is about 1 nanogram (billionth of a gram) per kilogram.