There are a number of ELISA Kits available for the measurement of NIACR1, another term for the human protein, hydroxycarboxylic acid receptor 2. Other synonyms may include: G protein-coupled receptor HM74a, G-protein coupled receptor 109A, G-protein coupled receptor HM74A, hydroxy-carboxylic acid receptor 2, nicotinic acid receptor, GPR109A, and HCA2. It is encoded by the HCAR2 gene to yield a protein 363 amino acids in length and 41.9 kDa in size. The protein is categorized into the G-protein coupled receptor 1 family. Versions of NIACR1 are present in other organisms, including: Mouse, Rat.