Anti-TRAP delta antibodies enable researchers to detect and measure the TRAP delta antigen in biological samples. This target is a reported synonym of the SSR4 gene, which encodes signal sequence receptor subunit 4. The human version of TRAP delta has a canonical amino acid length of 173 residues and a protein mass of 19 kilodaltons. It is reported to be localized in the ER of cells and widely expressed in many tissue types. Other names for this target antigen include CDG1Y, TRAPD, and translocon-associated protein subunit delta.