A late day sell-off in the biotech sector cost the Nasdaq Composite and S&P 500 indices all of their earlier gains, although the Dow Jones Industrial Average remained solidly on positive turf thanks to a rally in component stock Nike ( NKE ) and gains in the energy sector. Wall Street was in the green for most of Friday after Federal Reserve Chair Janet Yellen said a rate hike this year was "appropriate," with an unexpected upward revision to Q2 gross domestic product also easing investor concerns about the state of the economy.
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