Ready-to-use ELISA kits are available for the detection of Cd28l, an alias of the protein, CD80 molecule. The official gene symbol is CD80. The protein, with a mass of 33 kDa and length of 288 residues, is reported to be membrane-associated. It may be known by other names, including: costimulatory molecule variant IgV-CD80, costimulatory factor CD80, CTLA-4 counter-receptor B7.1, CD80 antigen (CD28 antigen ligand 1 B7-1 antigen), B-lymphocyte activation antigen B7, and T-lymphocyte activation antigen CD80, and B7-1.