Anti-HE3A antibodies are used in antigen-specific immunodetection in biological samples. The target HE3A is a known alias name of the protein epididymal protein 3A, encoded by the EDDM3A gene in humans. This protein has a canonical amino acid length of 147 residues and a mass of 17.6 kDa. The protein is secreted and features post-translational modifications. It is reported to be expressed in the epididymis and testis.