Page "Protein" Paragraph 40

Antibodies are protein components of an adaptive immune system whose main function is to bind antigens, or foreign substances in the body, and target them for destruction.

Antibodies can be secreted into the extracellular environment or anchored in the membranes of specialized B cells known as plasma cells.

Whereas enzymes are limited in their binding affinity for their substrates by the necessity of conducting their reaction, antibodies have no such constraints.

An antibody's binding affinity to its target is extraordinarily high.