updated 11/12/2010 10:50:09 AM ET 2010-11-12T15:50:09

Shares of some top biotechnology companies are down at 10 a.m.:

Amgen fell $.11 or .2 percent, to $54.51.

Biogen Idec fell $.28 or .4 percent, to $64.45.

Celgene fell $.42 or .7 percent, to $60.97.

Gilead Sciences fell $.37 or .9 percent, to $38.61.

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