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Yet , tiny changes can turn a benign resident into a killer . These benign tumors often cause no symptoms and may never need treatment . For example , crops that are engineered to express the Bt endotoxin , which is normally only produced by bacteria , will induce widespread insect resistance to this benign natural pesticide , and cause the loss of a valuable natural pest control tool . This benign schizophrenia might not please the scientific purist — or the theological purist , for that matter . It was like interviewing the benign chairman of a successful bank . Despite this benign description , the changes themselves reveal far broader consequences .