- an antibody formed in response to syphilis and reactive with cardiolipin in various blood tests for the disease.
- an antibody found in certain human allergies, as hay fever and asthma.
- a type of antibody that is formed against an allergen and is attached to the cells of a tissue. The antigen–antibody reaction that occurs on subsequent contact with the allergen causes tissue damage, leading to the release of histamine and other substances responsible for an allergic reaction
