CA 125 is a substance released by cells into the bloodstream.

Many more will have suffered from cancers brought on by one of the radioactive substances released.

It is also the sink for many anthropogenic substances released into the environment.

Questions have been raised about possible human health effects related to substances released during the shuttle break-up.

And bone cells release substances that may prompt faster cancer growth.

Hormone: A substance released by glands to stimulate certain activity in the body.

The Yale researchers found that a substance released by the body's white blood cells provoked a fever response.

Under such conditions, the platelets can release substances that cause further damage to the artery.

The senators also softened a plan to reduce the risk from toxic substances released into the air by industrial plants.

Medically, his problems began with damage to the muscle tissue, which released certain substances in the cells.