FIG. 1.

Structure of the STE20 region of the MAT A1 and MAT A2 loci of R. toruloides. Coding regions are shown as gray arrows, indicating the direction of transcription, and the transcribed regions identified by Akada et al. (2) are shown as black boxes. Genomic DNA fragments 1 to 6 were obtained either by genome walking or by PCR with gene-specific primers. The primers used in each case are indicated by arrowheads (see Table S1 in the supplemental material).