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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.
Bt toxin is produced by Bacillus thuringiensis in an inactive form (protoxin), which is transformed to its active form (delta-endotoxin) in the guts of certain insects. The active toxin binds to receptors in the gut, killing the insect.