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Despite being infected with Aspergillus fungus, this transgenic corn cob is not contaminated with aflatoxin, thanks to its defense line of RNA molecules that shut down the toxin production in the fungus. (Photo: Monica Schmidt) Despite being infected with Aspergillus fungus, this transgenic corn cob is not contaminated with aflatoxin, thanks to its defense line of RNA molecules that shut down the toxin production in the fungus.