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Background : B.thuringiensis produces an inactive crystalline toxin during sporulation which when ingested by an insect, gets activated and causes pore formation in gut , subsequently leading to death of the insect.

Question : What is the role of the toxin in bacteria's own metabolism ? Does it "unintentionally" kill the insects or is there an evolutionary advantage gained by the bacteria ?

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    $\begingroup$ Apparently the bacterium is an opportunistic pathogen. See here. $\endgroup$ – WYSIWYG Jul 10 '15 at 9:18

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