All are second messengers except:
High-Yield Explanation
Remember that guanylyl cyclase is an enzyme while cGMP is a secondary messenger
Types of second messengers
There are 3 basic types of secondary messenger molecules:
1. Hydrophobic
DAG
IP3
Phosphotidylinositol
2. Hydrophilic
cAMP
cGMP
3. Gases
NO
CO