Witness a government statement last month that experimental fields of genetically modified crops pose no risk to health.

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If pigs could be genetically modified to reduce the risk of organ rejection, it might be possible to use their organs for permanent transplants, not just temporary ones, many scientists believe.

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Last year a group of organic and family farmers sued Monsanto over similar issues, saying the pervasiveness of genetically modified crops elevates the risk of contamination of their crops with patented GMO traits, and raises the risk they will be sued by Monsanto for patent infringement.

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He said it was possible that people had modified their lifestyles to reduce exposure to risk factors such as tobacco smoke.

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The report, The Use of Genetically Modified Animals, did acknowledge the potential risk from GM animals escaping into the environment and breeding with non-GM animals.

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Some providers of single-country ETFs address concentration risk by using a "modified market weighting" to limit their exposure to a country's giant stocks, or simply by focusing on stocks of smaller companies.

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Environmentalists had argued that there might be a risk of cross-pollination between genetically modified plants and neighbouring crops.

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The more conservative method is to use a Modified IRR (MIRR) where all of the cash flows are assumed reinvested at the lower risk free rate.

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Under the TSA's risk-based security, Pistole has sought to "reduce the haystack, " giving modified screening to travelers under age 12 and over age 75.

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