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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.
2. Cholera exotoxin (choleragen), produced by Vibrio cholerae (inf). This exotoxin catalyzes the ADP-ribosylation of a host cell protein called Gs that turns the synthesis of a metabolic regulator molecule callec cyclic AMP (cAMP) on and off. In this case, synthesis stays turned on.