Figure 2 .

The Ras/PKA and Gpa2 pathways. The Ras/PKA pathway plays a central role in regulating growth vs. quiescence in response to the quality and quantity of the available carbon source, primarily by stimulating mass accumulation and inhibiting the stress response. The major input proceeds through Ras, likely in response to glucose-stimulated intracellular acidification, with minor input through the G-protein coupled receptor, Gpr1. Sch9 also mediates the cell growth response to glucose but the indicated link is only speculative. Red dots signify phosphorylation.