Ready-to-use ELISA kits are available for the detection of HG57, an alias of the protein, cysteinyl leukotriene receptor 2. The official gene symbol is CYSLTR2. The protein, with a mass of 39.6 kDa and length of 346 residues, is reported to be membrane-associated. It is a member of the G-protein coupled receptor 1 family and may be known by other names, including: HPN321, HG57, CYSLT2, cysteinyl leukotriene CysLT2 receptor, G-protein coupled receptor HG57, and G-protein coupled receptor GPCR21, and PSEC0146.