saxitoxin
Noun
Meaning
a powerful neurotoxin produced by certain dinoflagellates found in red tides; it can accumulate in mollusks that feed on the dinoflagellates and cause food poisoning to humans
Source: WordNetHypernyms
Examples
Shellfish consume the organisms responsible for red tide and concentrate Saxitoxin (produced from these organisms) in their tissues.
Saxitoxin blocks sodium channels and eating contaminated seafood can result in paralysis within 30 minutes.