Each antibody has a uniquely shaped variable region. Only one antigen shape will fit perfectly — like a lock and key. Click the matching antigen below.
Which region gives the antibody its unique specificity?
Task: Match the antibody to its antigen, then answer the questions about antibody structure and function.
Tip: The variable region is unique to each antibody clone. The constant region determines the antibody class (IgG, IgM, etc.). Press R to restart.