Provided below are ELISA kits targeting opioid receptor kappa 1, a human protein encoded by OPRK1. This protein is 380 amino acids long, with a mass of 42.6 kDa, and is a member of the G-protein coupled receptor 1 family. 2 isoforms have been identified. This is reported to be a membrane protein. Glycosylation sites have been reported. Other alias names for this protein include: kappa-type opioid receptor, Opiate receptor kappa-1, kappa opioid receptor, K-OR-1, KOR-1, and OPRK.