Consider this pathway: epinephrine ? G protein-coupled receptor ? G protein ? adenylyl cyclase ? cAMP. Identify the second messenger.

Consider this pathway: epinephrine ? G protein-coupled receptor ? G protein ? adenylyl cyclase ? cAMP. Identify the second messenger. 




A) cAMP
B) G protein
C) GTP
D) adenylyl cyclase
E) G protein-coupled receptor


Answer: A


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