Cyclic adenosine monophosphate (cAMP) is a small molecule second messenger that plays a key role in many biological processes, especially cell signaling downstream of GPCRs. cAMP has many biological functions including the regulation of gene expression, neuron signaling, cardiac function, and hormone release. Measuring cAMP levels in cells is important because it can help researchers study how drug compounds affect GPCR activity and signaling pathways inside the cell. Signosis has developed a competition-binding ELISA kit that can analyze cAMP in biological samples.