The V5 epitope tag is derived from a small epitope （Pk） present on the P and V proteins of the paramyxovirus of simian virus 5 （SV5）. The V5 tag antibody can be helpful in detecting the recombinant proteins, some of which include transmembrane and secreted proteins fusion protein. This V5-tag antibody is prepared by immunizing synthetic peptide GKPIPNPLLGLDST coupled to KLH.