Anti-kuduk antibodies are used in antigen-specific immunodetection in biological samples. The target kuduk is a known alias name of the protein transmembrane protein 258, encoded by the TMEM258 gene in humans. This 79-amino acid residue protein is a known subunit of the oligosaccharyl transferase (OST) complex that catalyzes the initial transfer of a defined glycan (Glc(3)Man(9)GlcNAc(2) in eukaryotes) from the lipid carrier dolichol-pyrophosphate to an asparagine residue within an Asn-X-Ser/Thr consensus motif in nascent polypeptide chains, the first step in protein N-glycosylation. It is localized to the membrane, ER, and cytoplasm of the cell. In terms of tissue expression, it is ubiquitously expressed across many tissue types.