<Tr> <Td> Second messenger </Td> <Td> cAMP (cyclic adenosine monophosphate) </Td> <Td> IP3; DAG; Ca2+ </Td> <Td> Arachidonic acid </Td> <Td> cGMP </Td> <Td> Ras. GTP (Small G Protein) </Td> </Tr> <Tr> <Td> Secondary effector </Td> <Td> protein kinase A </Td> <Td> PKC; CaM </Td> <Td> 5 - Lipoxygenase, 12 - Lipoxygenase, cycloxygenase </Td> <Td> protein kinase G </Td> <Td> MAP3K (c - Raf) </Td> </Tr>

What is the role of second messengers in signal-transduction pathways