Polychlorinated biphenyls (PCBs) have been associated with cancer for decades. Since the late 1990s, evidence has also linked the pollutants to cardiovascular disease among workers with long-term exposure to PCBs in electrical equipment. Researchers now report that experiments on mice have shown that corn oil, which is common in U.S. diets, can magnify a PCB's damage to cells lining blood vessels.
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