The research suggests that to grow, they have to be able to export the hormone into the main stem.

VOA: special.2009.10.13

Earlier work found that male stock traders made more money on days when their level of the male hormone testosterone was higher.

VOA: special.2009.02.25

"The maternal stress that is felt, that stress hormone -- one of them is called cortisol -- can actually leach into the womb.

VOA: special.2011.08.10

Mister Gray says one major difference is the way people react to the hormone testosterone.

VOA: special.2009.03.24

Talking leads to the release of the brain hormone oxytocin, which lowers her stress levels.

VOA: special.2009.03.24

Studies also show that chronic stress reduces the levels of the hormone estrogen in women.

VOA: special.2009.03.24

Xenopus are very sensitive to a pregnancy hormone -- human chorionic gonadotropin.

VOA: special.2010.06.29

This hormone is produced naturally by the pituitary gland in the brain.

VOA: special.2011.04.12

However,scientists have become concerned about the hormone's long-term effects on our health.

VOA: special.2009.03.24

Another substance that can improve performance is human growth hormone,or HGH.

VOA: special.2011.04.12

The body releases this hormone to deal with stressful situations.

VOA: special.2009.03.24

The buds release this hormone down the plant stem.

VOA: special.2009.10.06

Apical buds produce a growth hormone called auxin.

VOA: special.2009.10.06

Scientists discovered the hormone last century.

VOA: special.2010.06.29

This hormone flows down the main stem.

VOA: special.2009.10.13

Cortisol is called the "worry" hormone.

VOA: special.2009.03.24

"And the brain is activated by this challenging environment and signals to the fat to stop the release of this hormone.

VOA: standard.2010.07.14

During's field is gene therapy, so he's working on a way to recreate that effect by modifying the gene that controls the leptin hormone.

VOA: standard.2010.07.14

The study focuses on leptin, a hormone that helps control appetite.

VOA: standard.2009.12.30

And this particular hormone stimulates and feeds the cancer growth,essentially.

VOA: standard.2010.07.14

"We can get hormone levels, physiological data,disease status."

VOA: standard.2010.02.22

The pump developed by researchers is a double pump - in addition to insulin, it automatically secretes glucagon, a hormone that taps glucose reserves in the liver, raising blood sugar levels when they get too low, a condition called hypoglycemia.

VOA: standard.2010.04.15