U.S. stocks opened lower, on track for their sixth straight drop, after both the Federal Reserve and Bank of Japan expressed concern about the potential fallout from a "Brexit." The S&P 500 shed 7 points, or 0.4%%, to 2,063. The Dow industrials were off 56 points, or 0.3%, to 17,576. The Nasdaq Composite slid 22 points, or 0.5%, to 4,812. U.K. voters head to the polls on June 23 to decide whether to remain a member of the European Union, or to leave. Economists and market strategists say an "out" vote could instigate widespread turmoil in global markets.
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