This term is often used to describe biochemical substances.

Lab tests of her blood for hormones and biochemical substances showed normal values, though tests revealed that it might have been cause by hypersensitivity to estrogen.

ExoMars should obtain soil samples from up to 2 meters depth and make an extensive search for organic and biochemical substances.

They are an experimental cancer therapy that is purported to provide a natural biochemical substance that is excreted and therefore lacking in people with cancer.

These can include a dangerous buildup of bilirubin, lactase and many other biochemical substances.

A ligand is a biochemical substance.

Petri told Christine that Elasian women's tears contain a biochemical substance that acts like a super, grade A love potion.

All living plants and animals organize their foods into complex highly organized biochemical substances.

Tests for "markers," biochemical substances sometimes found in the blood of people with certain cancers, also proved negative.

Evidence that skipping a night's sleep lifts depression is leading scientists to search for a biochemical substance released during sleep that may bring on depression.