See immune system. A substance, foreign to the body, that stimulates the production of antibodies by the immune system. Antigens include foreign proteins, bacteria, viruses, pollen and other materials. Also refers to the material that is removed in this way. A type of white blood cell.
Basophils are one type of granulocyte.
A yellow or orange fluid made by the liver. Bile is stored in the gallbladder. It passes through the common bile duct into the duodenum, where it helps digest fat. Also called immuno-therapy. Uses substances produced by our own cells or biological response modifiers.