A gene encoding the human EP3 prostaglandin receptor has been cloned and sequenced. The protein encoded by this gene has seven transmembrane domains and is 81% homologous to the murine EP3 receptor. Two variants that differ in their carboxy terminal coding sequence, and one variant that differs in its 3′ untranslated sequence only, have also been cloned. The proteins, when expressed in eukaryotic cells, are capable of binding prostaglandins and their agonists and regulating adenylate cyclase activity in response to prostaglandins.