Nasdaq turns positive, led by biotech
The Dow Jones industrial average dropped 25.09 points, or 0.28 percent, to 9,083.42. The Standard & Poor's 500 Index fell 4.15 points, or 0.42 percent, to 978.03. But the Nasdaq Composite Index gained 4.41 points, or 0.22 percent, to 1,972.30.
(Reporting by Rodrigo Campos; Editing by Jan Paschal)