The S&P 500 snapped a five-day winning streak and closed slightly lower Tuesday, as a selloff in biotechnology and health-care stocks outweighed gains in the energy and materials sectors. The Dow Jones Industrial Average eked out a small gain, mainly thanks to a surge in shares of DuPont Co. . The S&P 500 closed 7.13 points, or 0.4%, lower at 1,979.92. The Dow Jones Industrial Average added 13.76 points, or less than 0.1%, to 16,790.19. The Nasdaq Composite ended the day down 32.90 points, or 0.7%, at 4,848.36.
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