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Wall Street mostly flat to open
A weak revenue outlook from Ciena Corp and mixed May sales data from McDonald's Corp added to the cautious tone in the market.
McDonald's, a Dow component, fell 1.3 percent to $80.11 while Ciena slumped 11 percent to $21.47.
The Dow Jones industrial average was down 2.88 points, or 0.02 percent, at 12,067.93. The Standard & Poor's 500 Index was down 0.63 points, or 0.05 percent, at 1,284.31. The Nasdaq Composite Index was down 8.12 points, or 0.30 percent, at 2,693.44.
(Reporting by Ryan Vlastelica; Editing by Padraic Cassidy)