A new member of the family of G protein-coupled receptors has been isolated from a rat pituitary eDNA library by the polymerase chain reaction (PCR) using degenerate oligonucleotide primers. The corresponding protein sequence shows seven transmembrane domains and contains conserved regions of homology characteristic of the G protein-coupled class of receptors. The novel receptor mRNA is expressed in the brain, pituitary gland and testis, and has been localized by in situ hybridization in discrete regions of the brain. Expression of the receptor mRNA in Xenopus ooeytes and in transfected mammalian cells has not yet permitted identification of the corresponding ligand for this receptor.

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