U.S. stocks open lower, but still on track for weekly gains

U.S. stocks opened lower on Friday as lower oil prices weighed on sentiment. However, the main indexes were on track to finish the week higher. The S&P 500 opened 6 points, or 0.3%, lower at 1,911. The Dow Jones Industrial Average lost 45 points, or 0.3%, to 16,368 shortly after the open. Meanwhile, the Nasdaq Composite began the day down 14 points, or 0.3%, at 4,472.

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