NEW YORK (AP) — Shares of some top biotechnology companies are down at 10 a.m.:

Amgen Inc. fell $.63 or .7 percent, to $86.53.

Biogen Idec fell $1.94 or 1.3 percent, to $143.71.

Celgene Corp. fell $.41 or .5 percent, to $74.75.

Gilead Sciences Inc. fell $.45 or .7 percent, to $66.14.