In March, President Obama ended restrictions on the use of federal money for research using human embryonic stem cells.

VOA: special.2009.04.07

Last year,President Obama ended restrictions on the use of federal money for studies of human embryonic stem cells.

VOA: special.2010.11.02

The disease is a form of stem rust named for its discovery in Uganda ten years ago.

VOA: special.2009.08.18

He heads the first-ever clinical trial of umbilical cord stem cells with cerebral palsy patients.

VOA: special.2011.02.01

Straw is the dried stem part of plants such as wheat, millet and sorghum.

VOA: special.2009.01.12

The world's last major outbreak of stem rust took place in the nineteen fifties.

VOA: special.2009.08.18

The doctor also says researchers could be able to limit the number of cells that can form tumors if they limit the number of normal stem cells.

VOA: special.2010.06.01

The disappearance of cancer stem cells,then, is important for cancer control.

VOA: special.2010.06.01

Stem rust produces reddish-brown spots on the stems of infected plants.

VOA: special.2009.08.18

The mixture caused the number of stem cells to decrease.

VOA: special.2010.06.01

(SAYING...) Nearly two-thirds of those polled said women and minorities in STEM careers were under-represented in their companies or institutions.

VOA: standard.2010.03.26

The government has even explored the possibility of closing schools to stem the spread of the virus.

VOA: standard.2009.07.31

"This is a new strain of stem rust organism that has the power to destroy most of the wheat varieties being grown around the world."

VOA: standard.2009.09.16

And until BP finds a way to stem the flow, no one can estimate the full effect of this disaster on BP, its shareholders,or employees.

VOA: standard.2010.06.18