Biotechnology companies shares mixed at 1 p.m.

Shares of some top biotechnology companies are mixed at 1 p.m.:

Amgen Inc. fell $.41 or .3 percent, to $119.01.

Biogen Idec rose $1.94 or .6 percent, to $316.70.

Celgene Corp. rose $.16 or .2 percent, to $86.62.

Gilead Sciences Inc. fell $.37 or .5 percent, to $81.43.