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

VOA: standard.2009.12.30

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

It took several years of further experiments and analysis, but During and his colleagues ultimately concluded that the mild stress of all that activity and interaction activated a communication channel that prompts fat cells to stop releasing a hormone called leptin, which accelerates cancer growth.

VOA: standard.2010.07.14

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

VOA: special.2010.06.29

Apical buds produce a growth hormone called auxin.

VOA: special.2009.10.06

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