Shares of biotechnology companies opened mixed Tuesday, as the broader market fell on continued concerns from rising oil prices and steep declines in overseas markets.
Here's how several key biotechnology stocks performed Tuesday:
Gilead Sciences Inc., down $1 at $51.95.
Amgen Inc., up 34 cents to $47.50.
Genentech Inc., up $1.74, or 2.3 percent, to $77.64.
Biogen Idec Inc., down 47 cents to $56.42.

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