Transducins, which are far better studied messenger chemicals, help to translate the light that reaches the retina into messages to be sent to the brain.

A host of messenger chemicals are involved in the transmission of taste signals, but the roles played by the various substances are not yet understood.

Studies, by Dr. Mann and others, have linked serotonin, a messenger chemical known to be involved in depression, to suicide.

It was a look at catecholamines, a class of naturally occurring compounds that act as messenger chemicals within the brain.

The tubular cells released their defensive and messenger chemicals, signaling the body for help.

The messenger chemicals are called hormones, and one of the most important is adrenalin, secreted by the adrenal glands just above your kidneys.

Dr. Krueger is focusing much of his research on cytokines, messenger chemicals of the immune system that are associated with white blood cells.

Hormones had seeped and messenger chemicals had washed into the deepest parts of her brain but the chemistry didn't matter to her anymore.

The target of the invention is serotonin, a powerful messenger chemical in the brain with a rainbow of effects.