telomerase caspase cytokine activity receptor signaling protein GTPase tumor necrosis factor fork head domain transcription factor protein phosphatase RPS6K cyclin RAS small monomeric GTPase map kinase oncogene cell cycle regulator protein serine/threonine kinase E3 growth factor activity PKC receptor tyrosine kinase 14-3-3 antioxidant nitric oxide synthase JAK cyclin-dependent protein kinase nadph oxidase Wnt calpain transcription activating factor 3.4.22.- PIP3 MDM2 PTEN TP53 AKT1