In conclusion, the ecology of Bt remains complex and we must avoid the temptation to overinterpret individual studies. An association of Bt with a particular environmental niche does not necessarily imply that the bacterium has evolved to thrive in that niche. The discovery of Bt strains that target human cancer cells, but not their noncancerous counterparts, is extremely interesting, but we doubt that anyone currently believes that Bt has evolved to specifically target human cancers.
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