FIG. 4.

Structure of a putative MAT locus in S. roseus and comparison with homologous genomic regions in R. toruloides and S. salmonicolor. The top panel shows the gene content and organization in a 40-kb region around the putative pheromone precursor (box A) and pheromone receptor (box B) genes in S. roseus. Additional genes identified in this region are depicted as white boxes and are listed in Table S3 of the supplemental material. The lower panels show the gene content and organization of the regions around the pheromone precursor (A) and the pheromone receptor (B) homologs in the three species. Unknown sequences are shown in light gray. The relative position and orientation of the genes marked “?” are unknown. All the remaining features are represented as in Fig. 1.