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saxitoxin

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saxitoxin /saxi·tox·in/ (sak´si-tok?sin) a powerful neurotoxin synthesized and secreted by certain dinoflagellates, which accumulates in the tissues of shellfish feeding on the dinoflagellates and may cause a severe toxic reaction in persons consuming contaminated shellfish.
sax·i·tox·in (sks-tksn)
n.
A potent neurotoxin produced by certain dinoflagellates that accumulates in shellfish feeding on these organisms and consequently causes food poisoning in humans who eat the shellfish.

saxitoxin
neurotoxic tetrahydropurine of the paralytic shellfish poisoning (PSP) toxin group from poisonous mussels, clams and plankton; a sodium channel blocker with the same mode of action as tetrodotoxin; originates in some toxic dinoflagellates and in some anabaena spp.

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