A very recent study by Podevain and du Jardin in 2012 found that the most common sequence that regulates expression in commercial GMOs also contains and encodes a significant fragment of a viral gene.
Among the affected commercial crops are some of the most widely grown GMOs, including Roundup Ready soybeans (40-3-2) and MON810 maize. They include the controversial NK603 maize recently reported as causing tumors in rats (Seralini et al. 2012).
This discovery will reignite the controversy surrounding the long term safety of GMOS which was not explored before their mass production and introduction into the commercial food market, and suggests that the focus on mandatory labeling efforts of GMO produce is even more imperative.
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