(c) RagAT21N and RagCQ120L suppress insulin-induced stimulation of S6K phosphorylation. pcDNA3 (200 ng, lanes 1 and 2) or each indicated Rag construct was co-transfected with HA-S6K (20 ng) or GST-Akt (100 ng) into HeLa cells. Cells were serum-starved overnight and stimulated with insulin (400 nM) for 30 min. 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. 