[powerful heat stable neurotoxin synthesized and secreted by certain dinoflagellates, which accumulates in the tissues of bivalve mollusks feeding on the dinoflagellates, and can cause a severe toxic reaction in animals consuming these shellfish. ( CSP )] (UMLS (CSP) C0036248) =Organic Chemical; Biologically Active Substance; Hazardous or Poisonous Substance =marine toxin; protozoal toxin