Plaque is a clear, sticky substance made in the mouth.

It is a substance made of about 80% lipid and 20% protein.

An element is a substance made with only one kind of atom.

A similar substance made from wood by heating it in an airless space is called charcoal.

This is a substance made by the body's white blood cells to fight infection and tissue damage.

It also slows the production of proteins and other substances made by the liver.

Antibodies are substances made by the body's immune system to fight a specific viral infection.

Enzymes, hormones and many other important substances made by the body are proteins.

Interleukin-2 is one of several substances made by the body that stimulates the immune system.

In rare cases, perphenazine may increase your level of a certain substance made by the body (prolactin).