anatoxin

model of anatoxin-a

Meaning

A bacterial toxin (usually an exotoxin) whose toxicity has been weakened or suppressed
A powerful neurotoxin, one of many toxins produced by several species of cyanobacterium.

ana- + toxin
From Anabaena flos-aquae (species) (now Dolichospermum flos-aquae (species)), the species from which the neurotoxin was first isolated

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