FAb (Fragment antigen-binding)

The F(ab) fragment is a part of an antibody that specifically binds to an antigen, such as a pathogen or a foreign substance. It is produced by splitting an entire antibody molecule, which has two main regions: one that binds to the target (F(ab)) and another that triggers other immune responses (Fc). The F(ab) fragment contains the binding sites, allowing it to recognize and attach to specific targets without the immune system activating other responses. This makes F(ab) fragments useful in diagnostics and therapies where targeted binding is essential, with reduced risk of unintended immune activation.