The enzyme Stell participates in several distinct MAP kinase signaling pathways in the budding yeast S. cerevisiae. What is the substrate for Ste 11 in the mating factor signaling pathway? When a yeast cell is stimulated by mating factor, what prevents induction of osmolytes required for survival in high-osmotic-strength media since Ste 11 also participates in the MAP kinase pathway initiated by high osmolarity?