Fab and scFv are two main building blocks to generate bispecific fragments. Most bispecific fragments contain at least one type of these two fragments. The bispecific fragments composed of both Fab and scFv include Bibody (Fab-scFv), Tribody, Fab-scFv-Fc, F(ab’)2-scFv2, etc. https://www.creative-biolabs.com/bsab/category/fab-scfv-fusion-proteins-191.htm