Fan fiction, also called fanfiction, is derivative fiction written using another author's characters and universe. Fanfiction authors write stories about their favorite characters from books, movies, or comics.
Antibodies, also called immunoglobulins, are proteins manufactured by the body that help fight against foreign substances called antigens. When an antigen enters the body, it stimulates the immune system to produce antibodies. (The immune system is the body's natural defense system.) The antibodies attach, or bind, themselves to the antigen and inactivate it. Every healthy adult's body has small amounts of thousands of different antibodies.
In a few types of autoimmune disease (such as rheumatic fever), a virus or infection with bacteria triggers an immune response and the antibodies or immune cells called T-cells attack normal cells because some part of their structure resembles a part of the infecting microorganism.utoimmune diseases arise when the immune system attacks one or more of the body's normal constituents as if they were invaders. When the immune system fails to recognize self it may produce immune cells or antibodies (called autoantibodies) that target its own cells, tissues, and/or organs.