Clones are screened for the presence of the gene product (a protein). This strategy requires first that a gene library is implemented in an expression vector, and that antiserum to the protein is available. Radioactivity or an enzyme is coupled generally with the secondary antibody. The radioactivity/enzyme linked secondary antibody can be purchased commercially and can detect different antigens. In commercial diagnostics labs, labelled primary antibodies are also used.
|This biotechnology article is a stub. You can help Wikipedia by expanding it.|