INGELHEIM, Germany & SAN DIEGO--(BUSINESS WIRE)--Boehringer Ingelheim and Arena Pharmaceuticals, Inc. (NASDAQ: ARNA) announced today that they have signed an exclusive agreement to conduct joint research to identify drug candidates targeting an undisclosed G protein-coupled receptor (GPCR), which belongs to the group of orphan CNS receptors. An “orphan receptor” is structurally related to a family of proteins that are known to act as functional cell-surface receptors but whose ligand has not yet been identified.
