Anti-DEFB121 antibodies are used in the immunodetection of the protein defensin beta 121. In humans, the canonical protein has a reported length of 76 amino acid residues and a mass of 8.5 kDa. It has been described to be a secreted protein. It is reported to be highly expressed in the male reproductive tract only. A member of the Beta-defensin protein family, DEFB121 is reported to exhibit antibacterial activity. Synonyms for this target antigen include beta-defensin 21, defensin, beta 21, epididymis secretory sperm binding protein, and beta-defensin 121. DEFB121 gene orthologs have been reported in the bovine and chimpanzee species. Immunohistochemistry is a widely used application for the DEFB121 antibodies listed below. In addition, Western Blot is also a common application.