It was an oxygenating agent rivaling rocket fuel in potency, a chemical secreted in sacs in the grendel's back.

They include chemicals secreted within the brain, in a part of the hypothalamus called the arcuate nucleus.

Formic acid is a type of chemical secreted by ants.

A zygospore remains dormant while it waits for environmental cues, such as light, moisture, heat, or chemicals secreted by plants.

I know it's weird,' she went on, 'but pleasure is merely the result of naturally occurring chemicals secreted in the brain, and cocaine can turn those chemicals on like a faucet.

Additionally, the study measured how the surgery affected blood levels of cortisol, a chemical secreted by the adrenal gland that shows how much stress a person is undergoing.

The small cornea's surface is keratinised and hardened, possibly an evolution to protect it from chemicals secreted by prey insects or self-impalement when it rolls itself up, which has been observed.

Nerve cell endings in the skin and white blood cells of the immune system are in intimate contact, and chemicals secreted by the nerves can shut down immune system cells nearby.

Chemotaxis also occurs in the antherozoids of liverworts, ferns, and mosses in response to chemicals secreted by the archegonia.

However, the Doctor reveals that all the Vore victims are actually still alive, but the chemicals secreted by the Vore render them invisible to humans.