<unk>  <unk>  is the technique of precipitating a protein antigen out of solution using an antibody that specifically binds to that particular protein. This process can be used to isolate and concentrate a particular protein from a sample containing many thousands of different proteins.<unk>  requires that the antibody be coupled to a solid substrate at some point in the procedure.
Immunoprecipitation
Immunofixation
Immunolabeling
Immunoassay
Western blot
Radioimmunoassay
Immunostaining
Chromatin immunoprecipitation