Figure 2.

The basal activity of the pheromone-signaling pathway depends on Hsp90. Strains expressing wild-type (DP122) or mutant Hsp90 (DP123 and DP124) and carrying the FUS1-HIS3 reporter gene were grown on indicator plates containing or lacking histidine. The strains are all derivatives of strain DP121. The plates were photographed after 3 d of incubation at 30°C.