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.