– 3X HA Tag (Triple-HA Tag) is a bioactive peptide consisting of three repetitive HA tags (YPYDVPDYA) linked by peptide bonds and is mainly used for protein and peptide detection as well as facilitating functional analysis of target proteins. 3X HA Tag can be specifically recognized and conjugated to anti-HA tag antibody, and is widely used in Western blot, immunofluorescence, immunoprecipitation and other experimental techniques.