There are a number of ELISA Kits available for the measurement of opioid receptor-like 1, another term for the human protein, opioid related nociceptin receptor 1. Other synonyms may include: nociceptin receptor, kappa-type 3 opioid receptor, kappa3-related opioid receptor, nociceptin/orphanin FQ receptor, orphanin FQ receptor, KOR-3, and NOCIR. It is encoded by the OPRL1 gene to yield a protein 370 amino acids in length and 40.7 kDa in size. However, there are up to 2 reported isoforms. The protein is categorized into the G-protein coupled receptor 1 family. Versions of opioid receptor-like 1 are present in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.