U.S. stocks opened marginally lower on Monday, with the Dow Jones Industrial Average set to take a breather after recording an impressive string of record gains. The blue-chip index slid 25 points, or 0.1%, to 20,800. The S&P 500 index declined two points, or 0.1%, to 2,365. The Nasdaq Composite Index shed 11 points, or 0.2%, to 5,833. Shares of Sotheby's rose after the auction house posted earnings and profits that beat estimates. Shares of La Jolla Pharmaceutical Co. soared after the company announced positive results from a phase 3 drug trial. The Dow posted its 11th straight record close on Friday
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