title: Information processing subsystems. Internal transducer. Signaling within the system.
mesh_terms: D002118:Calcium / Q000502:physiology; D002450:Cell Communication; D000242:Cyclic AMP / Q000502:physiology; D006152:Cyclic GMP / Q000502:physiology; D015870:Gene Expression; D011905:Genes, ras; D006801:Humans; D010743:Phospholipids / Q000502:physiology; D012333:RNA, Messenger; D015290:Second Messenger Systems / Q000502:physiology*; D014161:Transduction, Genetic
chemical_list: D010743:Phospholipids; D012333:RNA, Messenger; D000242:Cyclic AMP; D006152:Cyclic GMP; D002118:Calcium