Lexikon

an antobody is a special fighter protein synthetized by the immune cells of the immune system. They help protect the organism from disease. The immune system prepares a special protein for each kind of "intruder" that enters the body from the outside. These "intruders" are called antigens, which may be an isolated molecule (a protein or a glycoprotein, etc.) or a part of a living cell (e.g. the building blocks of the bacterial cell wall). The fighter proteins link up with the antigens like pieces of a puzzle. Once they're linked, the antigen is inactivated or killed.