Recombinant antibodies are antibody fragments produced by using recombinant antibody coding genes. Protein tags are peptide sequences genetically grafted onto a recombinant protein. Interferon can also be produced by recombinant mammalian cells. The antigens are either from cell extracts or recombinant. Brineura is enzyme replacement therapy manufactured through recombinant DNA technology. Etanercept is a fusion protein produced by recombinant DNA. Glutathione is useful for separation of GST tagged recombinant proteins. Many useful proteins are currently available as recombinant products. It is very commonly used in biology for protein expression and production of recombinant retroviruses. A recombinant protein is a protein whose code is carried by recombinant DNA. DNA-primed immune responses can be boosted by the administration of recombinant protein or recombinant poxviruses. Molecular cloning is the laboratory process used to create recombinant DNA. This can be seen with the folding of recombinant proteins. Aldesleukin is a form of recombinant interleukin-2. Berg is arguably most famous for his pioneering work involving gene splicing of recombinant DNA.