In our discussion on the epinephrine signal transduction pathway, we mentioned that this pathway uses a special type of receptor we call the seven transmembrane helix receptor or simply the seven TM receptor. And because these receptors actually use Gproteins, we also sometimes call them g coupled protein receptors. Now, it turns out that the epinephrine reference signaling pathway is not the only pathway inside our body that uses these g coupled protein receptors, these seven TM receptors. Another important pathway that uses these seven TM receptors is the phosphoride signal transduction pathway or simply the phosphorusotide cascade. Now, before we actually take a look at the details of this particular signal transduction pathway, what's an example of a g coupled protein receptor inside our body that uses this pathway? Well, one common example is angiotensin two receptors.