2. Complementary Interactions between Proteins and Ligands: The Immune System and Immunoglobulins

• The Immune Response Includes a Specialized Array of Cells and Proteins

• Antibodies Have Two Identical Antigen-Binding Sites

• Antibodies Bind Tightly and Specifically to Antigen

• The Antibody-Antigen Interaction Is the Basis for a Variety of Important Analytical Procedures