Once they start dividing, stem cells are likely to turn into nerve, muscle, or other tissues--and they stop being stem cells.

FORBES: Small Stem Cells Find Big Backers

He wants Italy to stop bombing Libya to stem the flow of refugees across the Mediterranean.

ECONOMIST: Italian politics

The scientists are already carrying out further research to see if they stop this molecule in stem cells.

BBC: NEWS | Health | Molecule 'helps cancer to spread'

The Obama administration is appealing the judge's order, and said this week it would require the government to stop funding all embryonic stem-cell research, including that allowed under more-restrictive rules set by the Bush administration.

WSJ: Stem-Cell Plaintiffs Cite Ethical Motivation

Officials in several states are seeking to stem the strategy by limiting so-called stop-loss insurance, which covers unexpected, large health-care bills for self-insured companies.

WSJ: One Strategy for Health-Law Costs: Self Insure

For the diabetics treated in Argentina, more than two-thirds were able to stop taking insulin and diabetes medications following the stem cell treatment.

FORBES: Despite Bush Veto, Stem Cell Research Abounds

Damascus was the next stop, where Annan secured assurances from the Syrian government that it would help stem the flow of weapons to Hezbollah.

NPR: The U.N., the U.S. and the Middle East

After lobbying vigorously to stem the flow of Russian technology to Iran, Israel appears to have accepted that nothing is likely to stop the Shahab series of missiles from being developed.

ECONOMIST: Israel��s missile nightmares

We enacted measures to stem the tide of foreclosures in our housing market, helping responsible homeowners stay in their homes and helping to stop the broader decline in home values which was eating away at what tends to be a family's largest asset.

WHITEHOUSE: Job Creation and Economic Growth