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In Fig. 4e of this Letter, the arrowhead from TSC to Rheb should be a horizontal bar (as from PKB to TSC). In addition, the phosphorylation sites of IRS1 for human should be S312 and S636/639 and for mouse the corresponding phosphorylation sites should be IRS1 S307 and S632/S635. This does not affect any of the results or conclusions of the paper.