DEFB3 ELISA kits are assays designed to detect the peptide, defensin beta 3. It is a small protein that contains a motif composed of six cysteine residues and three intramolecular disulfide bridges. Expressed in the epithelial tissues of many organs, it plays a role in the adaptive and innate immune responses as an antimicrobial peptide effective against Gram-positive and Gram-negative bacteria, fungi, and certain viruses. Visit the supplier page for more information about detection range and reactivity.