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exotoxin exÂ·oÂ·toxÂ·in (Äk'sÅ-tÅk'sÄ­n) n. A toxin secreted by a microorganism and released into the environment in which it grows. Also called extracellular toxin.
toxin. a poison, especially a protein or conjugated protein produced by certain animals, some higher plants, and pathogenic bacteria. Antigenic toxins, produced by bacteria or helminths, stimulate production of antitoxins.Exotoxins are produced by bacteria and diffuse into surroundings, e.g. tetanus toxin, or can be ingested preformed, e.g. botulinum toxin. Endotoxins are released into the surrounding tissue only when the bacteria break down.ntigenic toxins, produced by bacteria or helminths, stimulate production of antitoxins. Exotoxins are produced by bacteria and diffuse into surroundings, e.g. tetanus toxin, or can be ingested preformed, e.g. botulinum toxin. Endotoxins are released into the surrounding tissue only when the bacteria break down.