Tags, also called antigen epitopes and antigen determinant, refer to the special region or group of antigen molecules that determine the specificity of antigen, and the structure or sequence that specifically combines with antibody. The fusion protein containing the target gene and epitope label was constructed with DNA recombination technique, and then the fusion protein was identified and purified by specific tag antibody. Tag antibodies can be highly specific combined with the corresponding tag fusion protein, which are common tools for researches in gene protein expression, signal transduction and gene function.
Cell markers, also known as cell surface antigens, can be used as cell surface antigens for identification and classification of cells. The majority of cell markers are molecules or antigens on the surface of cell membranes. Unique to different cell types, there exist specific markers or antigens, which not only act as markers for specific cells, but also play key functional roles. It is possible to diagnose diseases or direct treatment by identifying the presence of these specific markers.
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