Figure 2.

Schematic depiction of some of the positive stimuli on hyphal induction (boxed in red and red arrows) and inhibitory signals (black). The cellular mediators of the hyphal morphogenetic pathways are depicted in yellow ovals and the transcription activators that induce hyphal growth are in orange ovals. The internal signals feeding back from the morphogenetic apparatus (dashed lines) and the cell cycle apparatus (solid lines) to the hypha-specific gene (HSG) expression program are shown in blue. See text for details of the individual interactions. The question mark indicates that it is still unclear whether Cdc42 affects the HSG expression directly or indirectly via its effect on the cytoskeleton.