U.S. stocks opened slightly higher on Tuesday after worries about the financial health of European banking giant Deutsche Bank helped erase strong gains in premarket trading. The S&P 500 index rose 2 points, or 0.1%, to 2,163.57. The Dow Jones Industrial Average climbed 18 points, or 0.1%, to 18,274. The Nasdaq Composite Index added 13 points, or 0.3%, to 5,315.
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