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

Amgen Inc. fell $.85 or 1.0 percent, to $84.58.

Biogen Idec fell $1.63 or 1.1 percent, to $147.75.

Celgene Corp. fell $3.71 or 4.6 percent, to $76.20.

Gilead Sciences Inc. fell $.87 or 1.3 percent, to $67.91.