Ready-to-use ELISA kits are available for the detection of CD3 antigen, delta polypeptide, an alias of the protein, CD3d molecule. The official gene symbol is CD3D. The protein, with a mass of 18.9 kDa and length of 171 residues, is reported to be membrane-associated. It may be known by other names, including: CD3-DELTA, T-cell receptor T3 delta chain, CD3d molecule delta (CD3-TCR complex), CD3d antigen delta polypeptide (TiT3 complex), CD3 antigen delta subunit, and T-cell surface glycoprotein CD3 delta chain, and T3D.