Weizmann Institute scientists have discovered Corticotropin Releasing Hormone. CRH is a kind of “on-off” switch in the brain for regulating the release of Cortisol (a main stress hormone) in the body. The finding is relevant to research into a number of stress-related neurological disorders.
http://wis-wander.weizmann.ac.il/a-unique-on-off-switch-for-hormone-production