The CRE Leeporter™ Luciferase Reporter cell line is a stably transfected HEK 293 cell line which expresses Renilla luciferase reporter gene under the transcriptional control of the cAMP response element (CRE). The CRE Leeporter™ cell line is designed to monitor the cAMP/PKA signaling pathways and can be used for studying GPCR-linked cAMP/PKA signaling pathways as well as screening of agonists, antagonists or signaling inhibitors related with the cAMP/PKA signaling pathways. Functional activity of the cell line has been validated by serum stimulation assay (Figure 1).