Protein tags are protein or peptide sequences located either on the C- or N- terminal of the target protein, which facilitates one or several of the following characteristics: solubility, detection, purification, localization and expression. The DYKDDDDK(DYKDDDDK) peptide has been used extensively as a general tag in expression vectors. This peptide can be expressed and detected with the protein of interest as an amino-terminal or carboxy-terminal fusion. N-terminal DYKDDDDK vectors provide an Ek cleavage site for removal of the fusion tag. The DYKDDDDK peptide is likely to be located on the surface of a fusion protein because of its hydrophilic nature. As a result, the DYKDDDDK peptide is more likely to be accessible to antibodies. A DYKDDDDK-Tag can be used in many different assays that require recognition by an antibody, such as western blotting, immunocytochemistry, immunoprecipitation, flow cytometry, protein purification, and in the study of protein-protein interactions, cell ultrastructure, and protein localization and so on. This antibody is a mouse monoclonal antibody raised against3xDYKDDDDK DYKDDDDK sequence and recognizes the (3x)DYKDDDDK peptide and detects DYKDDDDK-Tagged proteins.