American concern centers on Iran's efforts to develop a missile called the Shahib 3, which is expected to have the range to strike Israel.

Much of the concern centers on efforts to make entire microbes.

The growing concern centers on the question of when and to what extent doctors should use the many death-thwarting machines and techniques available today.

The concern centers on the size of the 30-year bond auction.

The skepticism is multilayered, but the greatest concern centers on the company's chairman, Alan Lubinsky.

In Parliament, concern centers on the worry that Britain will simply follow the lead of Washington rather than determine its own way.

This spring, the concern centers on Cameron's adjustment to right field and Matsui's adjustment to second base.

The second concern centers on G.M.'s vehicle development and introduction costs.

Another concern centres on how long the vaccine lasts.

Another Greek Cypriot concern centres on the procedural process for new talks.