Cells have to react upon a wide variety of signals. The term signal transduction describes the overall process of how cells convert an extracellular signal into a specific cellular response and includes plenty of different intracellular signaling pathways. However, there are intracellular signaling molecules which are found in almost all signal transduction pathways. List 10 signal transduction pathways that involve protein tyrosine kinases. Give one example diagram of the signal transduction pathway that involves a protein kinase..