Schematic model of the interconnection of the genes addressed in this study with pathways in mating and development of S. commune. The genetic background with mating type genes and the phenotypes associated with central Ras signaling are specifically included. Yellow, functional groups of genes regulated by Ras1; blue, regulation by Gap1; red, regulation by Cdc42; green, regulation by Ras1/Gap1; purple, regulation by Gap1/Cdc42; gray, regulation by Ras1/Gap1/Cdc42. TPK, tyrosine protein kinase.