Figure 2.

Schematic model depicting integration of environmental cues in the ASI sensory neurons. Molecules that promote reproductive development are green, and those that promote dauer arrest are red. A generic transmembrane ascaroside receptor is portrayed as a thick red line. DAF-1 and DAF-4 are homologs of the human type I and type II TGFβ receptor, respectively. See text for details. IGFR, insulin-like growth factor receptor; ILP, insulin-like peptide.