Wall Street opens lower as Apple, Celgene weigh

Wall Street opened lower on Thursday as Apple weighed on the major indexes and Celgene led a fall in biotech stocks, more than offsetting encouraging economic data. The Nasdaq biotech index dropped 1.7 percent. Apple fell 2.3 percent to $125.70 and was the biggest drag on the Dow, S&P 500 and the Nasdaq. The company limited availability of the Apple Watch after a key component supplied by a Chinese company was found to be defective, according to the Wall Street Journal.