The proposal urged researchers to document carefully an animal's breeding history and preserve blood samples from each animal used in a xenotransplant.

Rather, in conducting inventories of biological agents, most have urged researchers to consider seriously, and justify, their need for sensitive materials.

He urged researchers and students to preserve his journalistic contributions by doing research on his work.

Many participants at the heart association meeting urged researchers to press on with their goal of perfecting total artificial hearts and assist devices.

Martens urged researchers to get out of the laboratory and onto the field to meet athletes and coaches on their own turf.

He also urged privately funded researchers not to clone humans.

Mainstream scientists, even those who have long urged researchers to speak with a louder voice in public debates, stayed away from Kansas.

The clinical successes of these two cephalosporins urged researchers to improve the pharmacological properties and develop more agents.

It also urges researchers studying women's issues to include questions about sexual orientation in study designs.

And we must urge educational researchers to systematically document - in both narrative and quantitative detail - how each of these schools actually works.