U.S. stock-market indexes opened marginally lower on Friday but were still on track to post modest weekly gains. The S&P 500 was flat at 2,684.79. The Dow Jones Industrial Average began the session off 20 points, or 0.1%, at 24,770. The tech-heavy Nasdaq Composite index traded at 6,956, 9 points, or 0.1%, below its previous close. Among the worst performers on Wall Street shares of Celgene were down sharply after reporting disappointing Phase III data on Revlimid.
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