(c) Rag regulates TORC1 but not TORC2 activity. Each indicated Rag construct (200 ng) was co-transfected with either HA-S6K (20 ng), Myc-4EBP1 (20 ng) or of GST-Akt (100 ng). Phosphorylation and protein levels were determined by immunoblotting with the appropriate antibodies, as indicated. Full scans of blots are provided in Supplementary Information, Fig. S6. 