NEW YORK (AP) — Shares of some top biotechnology companies are down at 1 p.m.:

Amgen Inc. fell $2.10 or 2.4 percent, to $85.19.

Biogen Idec fell $1.63 or 1.2 percent, to $138.67.

Celgene Corp. fell $1.70 or 2.3 percent, to $72.36.

Gilead Sciences Inc. fell $1.55 or 2.3 percent, to $65.92.