English: Types of monoclonal antibodies with other structures than naturally occurring antibodies.

• Top row: monospecific antibodies ( fragment antigen-binding , F(ab') ₂ fragment , Fab' fragment , single-chain variable fragment , di-scFv , single domain antibody )
• Bottom row: bispecific antibodies ( trifunctional antibody , chemically linked F(ab') ₂ , bi-specific T-cell engager )

Legend:

• Heavy chains have a darker shade, light chains a lighter one.
• Parts of antibodies with different targets are coloured differently.
• Constant regions are shown as regular round-edged boxes, variable regions as boxes with an irregularly shaped end.
• Artificial links between fragments are coloured red.